431161344636531 has 32 divisors (see below), whose sum is σ = 612867389080320. Its totient is φ = 268682066509824.

The previous prime is 431161344636527. The next prime is 431161344636541. The reversal of 431161344636531 is 135636443161134.

It is not a de Polignac number, because 431161344636531 - 2² = 431161344636527 is a prime.

It is a super-2 number, since 2×431161344636531² (a number of 30 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (431161344636511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6692205 + ... + 30118238.

It is an arithmetic number, because the mean of its divisors is an integer number (19152105908760).

Almost surely, 2^{431161344636531} is an apocalyptic number.

431161344636531 is a deficient number, since it is larger than the sum of its proper divisors (181706044443789).

431161344636531 is a wasteful number, since it uses less digits than its factorization.

431161344636531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36812035.

The product of its digits is 5598720, while the sum is 51.

Adding to 431161344636531 its reverse (135636443161134), we get a palindrome (566797787797665).

The spelling of 431161344636531 in words is "four hundred thirty-one trillion, one hundred sixty-one billion, three hundred forty-four million, six hundred thirty-six thousand, five hundred thirty-one".