31131251092 has 6 divisors (see below), whose sum is σ = 54479689418. Its totient is φ = 15565625544.

The previous prime is 31131251083. The next prime is 31131251131. The reversal of 31131251092 is 29015213113.

It can be written as a sum of positive squares in only one way, i.e., 26436808836 + 4694442256 = 162594^2 + 68516^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 31131251092.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3891406383 + ... + 3891406390.

Almost surely, 2^31131251092 is an apocalyptic number.

It is an amenable number.

31131251092 is a deficient number, since it is larger than the sum of its proper divisors (23348438326).

31131251092 is a wasteful number, since it uses less digits than its factorization.

31131251092 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7782812777 (or 7782812775 counting only the distinct ones).

The product of its (nonzero) digits is 1620, while the sum is 28.

It can be divided in two parts, 311312 and 51092, that added together give a square (362404 = 602²).

The spelling of 31131251092 in words is "thirty-one billion, one hundred thirty-one million, two hundred fifty-one thousand, ninety-two".