981545421 has 4 divisors (see below), whose sum is σ = 1308727232. Its totient is φ = 654363612.

The previous prime is 981545419. The next prime is 981545431. The reversal of 981545421 is 124545189.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 124545189 = 3 ⋅41515063.

It is not a de Polignac number, because 981545421 - 2¹ = 981545419 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 981545421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981545431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 163590901 + ... + 163590906.

It is an arithmetic number, because the mean of its divisors is an integer number (327181808).

Almost surely, 2^981545421 is an apocalyptic number.

It is an amenable number.

981545421 is a deficient number, since it is larger than the sum of its proper divisors (327181811).

981545421 is a wasteful number, since it uses less digits than its factorization.

981545421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327181810.

The product of its digits is 57600, while the sum is 39.

The square root of 981545421 is about 31329.6252930034. The cubic root of 981545421 is about 993.8102395823.

The spelling of 981545421 in words is "nine hundred eighty-one million, five hundred forty-five thousand, four hundred twenty-one".