31816004131 has 4 divisors (see below), whose sum is σ = 32113350072. Its totient is φ = 31518658192.

The previous prime is 31816004093. The next prime is 31816004137. The reversal of 31816004131 is 13140061813.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13140061813 = 67433 ⋅194861.

It is a cyclic number.

It is not a de Polignac number, because 31816004131 - 2⁹ = 31816003619 is a prime.

It is a super-2 number, since 2×31816004131² (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 31816004131.

It is not an unprimeable number, because it can be changed into a prime (31816004137) 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, 148672810 + ... + 148673023.

It is an arithmetic number, because the mean of its divisors is an integer number (8028337518).

Almost surely, 2^31816004131 is an apocalyptic number.

31816004131 is a deficient number, since it is larger than the sum of its proper divisors (297345941).

31816004131 is a wasteful number, since it uses less digits than its factorization.

31816004131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297345940.

The product of its (nonzero) digits is 1728, while the sum is 28.

Adding to 31816004131 its reverse (13140061813), we get a palindrome (44956065944).

The spelling of 31816004131 in words is "thirty-one billion, eight hundred sixteen million, four thousand, one hundred thirty-one".