431664431 has 4 divisors (see below), whose sum is σ = 470906664. Its totient is φ = 392422200.

The previous prime is 431664427. The next prime is 431664461. The reversal of 431664431 is 134466134.

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

It is a cyclic number.

It is not a de Polignac number, because 431664431 - 2² = 431664427 is a prime.

It is a super-2 number, since 2×431664431² = 372668361981107522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (431664461) 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, 19621100 + ... + 19621121.

It is an arithmetic number, because the mean of its divisors is an integer number (117726666).

Almost surely, 2^431664431 is an apocalyptic number.

431664431 is a deficient number, since it is larger than the sum of its proper divisors (39242233).

431664431 is a wasteful number, since it uses less digits than its factorization.

431664431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39242232.

The product of its digits is 20736, while the sum is 32.

The square root of 431664431 is about 20776.5355870511. The cubic root of 431664431 is about 755.7568429157.

The spelling of 431664431 in words is "four hundred thirty-one million, six hundred sixty-four thousand, four hundred thirty-one".