31138919725 has 48 divisors (see below), whose sum is σ = 41461453440. Its totient is φ = 23138438400.

The previous prime is 31138919723. The next prime is 31138919753. The reversal of 31138919725 is 52791983113.

It is not a de Polignac number, because 31138919725 - 2¹ = 31138919723 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31138919723) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14019115 + ... + 14021335.

It is an arithmetic number, because the mean of its divisors is an integer number (863780280).

Almost surely, 2^31138919725 is an apocalyptic number.

It is an amenable number.

31138919725 is a deficient number, since it is larger than the sum of its proper divisors (10322533715).

31138919725 is a wasteful number, since it uses less digits than its factorization.

31138919725 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2950 (or 2945 counting only the distinct ones).

The product of its digits is 408240, while the sum is 49.

The spelling of 31138919725 in words is "thirty-one billion, one hundred thirty-eight million, nine hundred nineteen thousand, seven hundred twenty-five".