31138791304 has 8 divisors (see below), whose sum is σ = 58385233710. Its totient is φ = 15569395648.

The previous prime is 31138791263. The next prime is 31138791347. The reversal of 31138791304 is 40319783113.

It can be written as a sum of positive squares in only one way, i.e., 26765614404 + 4373176900 = 163602^2 + 66130^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1946174449 + ... + 1946174464.

Almost surely, 2^31138791304 is an apocalyptic number.

It is an amenable number.

31138791304 is a deficient number, since it is larger than the sum of its proper divisors (27246442406).

31138791304 is a wasteful number, since it uses less digits than its factorization.

31138791304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3892348919 (or 3892348915 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 40.

The spelling of 31138791304 in words is "thirty-one billion, one hundred thirty-eight million, seven hundred ninety-one thousand, three hundred four".