31531145031 has 12 divisors (see below), whose sum is σ = 47942092120. Its totient is φ = 19914407280.

The previous prime is 31531145017. The next prime is 31531145053. The reversal of 31531145031 is 13054113513.

It is a happy number.

31531145031 is a `hidden beast` number, since 3 + 153 + 1 + 1 + 4 + 503 + 1 = 666.

It is not a de Polignac number, because 31531145031 - 2⁵ = 31531144999 is a prime.

It is a super-2 number, since 2×31531145031² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31531144986 and 31531145004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31531145071) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 92196160 + ... + 92196501.

Almost surely, 2^31531145031 is an apocalyptic number.

31531145031 is a deficient number, since it is larger than the sum of its proper divisors (16410947089).

31531145031 is a wasteful number, since it uses less digits than its factorization.

31531145031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184392686 (or 184392683 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

Adding to 31531145031 its reverse (13054113513), we get a palindrome (44585258544).

The spelling of 31531145031 in words is "thirty-one billion, five hundred thirty-one million, one hundred forty-five thousand, thirty-one".