1952478030721 has 3 divisors (see below), whose sum is σ = 1952479428033. Its totient is φ = 1952476633410.

The previous prime is 1952478030719. The next prime is 1952478030779. The reversal of 1952478030721 is 1270308742591.

The square root of 1952478030721 is 1397311.

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

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.

It is not a de Polignac number, because 1952478030721 - 2¹ = 1952478030719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1952478030781) 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, 698656 + ... + 2095966.

It is an arithmetic number, because the mean of its divisors is an integer number (650826476011).

Almost surely, 2^{1952478030721} is an apocalyptic number.

1952478030721 is the 1397311-st square number.

1952478030721 is the 698656-th centered octagonal number.

It is an amenable number.

1952478030721 is a deficient number, since it is larger than the sum of its proper divisors (1397312).

1952478030721 is an frugal number, since it uses more digits than its factorization.

1952478030721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2794622 (or 1397311 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 49.

Multiplying 1952478030721 by its sum of digits (49), we get a square (95671423505329 = 9781177²).

The spelling of 1952478030721 in words is "one trillion, nine hundred fifty-two billion, four hundred seventy-eight million, thirty thousand, seven hundred twenty-one".