31232505131 has 4 divisors (see below), whose sum is σ = 31698661992. Its totient is φ = 30766348272.

The previous prime is 31232505119. The next prime is 31232505149. The reversal of 31232505131 is 13150523213.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31232505131 is a prime.

It is a super-2 number, since 2×31232505131² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 31232505131.

It is not an unprimeable number, because it can be changed into a prime (31232505191) 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, 233078330 + ... + 233078463.

It is an arithmetic number, because the mean of its divisors is an integer number (7924665498).

Almost surely, 2^31232505131 is an apocalyptic number.

31232505131 is a deficient number, since it is larger than the sum of its proper divisors (466156861).

31232505131 is an equidigital number, since it uses as much as digits as its factorization.

31232505131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 466156860.

The product of its (nonzero) digits is 2700, while the sum is 26.

The spelling of 31232505131 in words is "thirty-one billion, two hundred thirty-two million, five hundred five thousand, one hundred thirty-one".