31204324431 has 24 divisors (see below), whose sum is σ = 51516585120. Its totient is φ = 17829421056.

The previous prime is 31204324391. The next prime is 31204324433. The reversal of 31204324431 is 13442340213.

31204324431 is a `hidden beast` number, since 3 + 1 + 204 + 3 + 24 + 431 = 666.

It is not a de Polignac number, because 31204324431 - 2¹⁸ = 31204062287 is a prime.

It is a super-2 number, since 2×31204324431² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31204324395 and 31204324404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31204324433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1188615 + ... + 1214583.

It is an arithmetic number, because the mean of its divisors is an integer number (2146524380).

Almost surely, 2^31204324431 is an apocalyptic number.

31204324431 is a deficient number, since it is larger than the sum of its proper divisors (20312260689).

31204324431 is a wasteful number, since it uses less digits than its factorization.

31204324431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45055 (or 45052 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

Adding to 31204324431 its reverse (13442340213), we get a palindrome (44646664644).

The spelling of 31204324431 in words is "thirty-one billion, two hundred four million, three hundred twenty-four thousand, four hundred thirty-one".