31131211304 has 8 divisors (see below), whose sum is σ = 58371021210. Its totient is φ = 15565605648.

The previous prime is 31131211283. The next prime is 31131211339. The reversal of 31131211304 is 40311213113.

It can be written as a sum of positive squares in only one way, i.e., 20221408804 + 10909802500 = 142202^2 + 104450^2 .

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 (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1945700699 + ... + 1945700714.

Almost surely, 2^31131211304 is an apocalyptic number.

It is an amenable number.

31131211304 is a deficient number, since it is larger than the sum of its proper divisors (27239809906).

31131211304 is a wasteful number, since it uses less digits than its factorization.

31131211304 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3891401419 (or 3891401415 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 31131211304 its reverse (40311213113), we get a palindrome (71442424417).

The spelling of 31131211304 in words is "thirty-one billion, one hundred thirty-one million, two hundred eleven thousand, three hundred four".