941988654721 has 3 divisors (see below), whose sum is σ = 941989625283. Its totient is φ = 941987684160.

The previous prime is 941988654713. The next prime is 941988654781. The reversal of 941988654721 is 127456889149.

The square root of 941988654721 is 970561.

It is a perfect power (a square), and thus also a powerful number.

941988654721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 127456889149 = 15991 ⋅7970539.

It can be written as a sum of positive squares in only one way, i.e., 12075592321 + 929913062400 = 109889^2 + 964320^2 .

It is not a de Polignac number, because 941988654721 - 2³ = 941988654713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (941988654781) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 485281 + ... + 1455841.

It is an arithmetic number, because the mean of its divisors is an integer number (313996541761).

Almost surely, 2^941988654721 is an apocalyptic number.

941988654721 is the 970561-st square number.

941988654721 is the 485281-st centered octagonal number.

It is an amenable number.

941988654721 is a deficient number, since it is larger than the sum of its proper divisors (970562).

941988654721 is an frugal number, since it uses more digits than its factorization.

941988654721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1941122 (or 970561 counting only the distinct ones).

The product of its digits is 34836480, while the sum is 64.

Multiplying 941988654721 by its sum of digits (64), we get a square (60287273902144 = 7764488²).

The spelling of 941988654721 in words is "nine hundred forty-one billion, nine hundred eighty-eight million, six hundred fifty-four thousand, seven hundred twenty-one".