431221528961 has 4 divisors (see below), whose sum is σ = 431638975812. Its totient is φ = 430804082112.

The previous prime is 431221528951. The next prime is 431221528963. The reversal of 431221528961 is 169825122134.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 404456568961 + 26764960000 = 635969^2 + 163600^2 .

It is a cyclic number.

It is not a de Polignac number, because 431221528961 - 2²² = 431217334657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (431221528963) 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, 208721876 + ... + 208723941.

It is an arithmetic number, because the mean of its divisors is an integer number (107909743953).

Almost surely, 2^431221528961 is an apocalyptic number.

It is an amenable number.

431221528961 is a deficient number, since it is larger than the sum of its proper divisors (417446851).

431221528961 is a wasteful number, since it uses less digits than its factorization.

431221528961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417446850.

The product of its digits is 207360, while the sum is 44.

The spelling of 431221528961 in words is "four hundred thirty-one billion, two hundred twenty-one million, five hundred twenty-eight thousand, nine hundred sixty-one".