431255561 has 4 divisors (see below), whose sum is σ = 470460624. Its totient is φ = 392050500.

The previous prime is 431255527. The next prime is 431255563. The reversal of 431255561 is 165552134.

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.

It is a cyclic number.

It is not a de Polignac number, because 431255561 - 2¹⁴ = 431239177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (431255563) 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, 19602515 + ... + 19602536.

It is an arithmetic number, because the mean of its divisors is an integer number (117615156).

Almost surely, 2^431255561 is an apocalyptic number.

It is an amenable number.

431255561 is a deficient number, since it is larger than the sum of its proper divisors (39205063).

431255561 is a wasteful number, since it uses less digits than its factorization.

431255561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39205062.

The product of its digits is 18000, while the sum is 32.

The square root of 431255561 is about 20766.6935500094. The cubic root of 431255561 is about 755.5181513979.

The spelling of 431255561 in words is "four hundred thirty-one million, two hundred fifty-five thousand, five hundred sixty-one".