31516725071 has 4 divisors (see below), whose sum is σ = 33941088552. Its totient is φ = 29092361592.

The previous prime is 31516725061. The next prime is 31516725077. The reversal of 31516725071 is 17052761513.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 31516725071 - 2¹⁰ = 31516724047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31516725077) 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, 1212181721 + ... + 1212181746.

It is an arithmetic number, because the mean of its divisors is an integer number (8485272138).

Almost surely, 2^31516725071 is an apocalyptic number.

31516725071 is a deficient number, since it is larger than the sum of its proper divisors (2424363481).

31516725071 is a wasteful number, since it uses less digits than its factorization.

31516725071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2424363480.

The product of its (nonzero) digits is 44100, while the sum is 38.

The spelling of 31516725071 in words is "thirty-one billion, five hundred sixteen million, seven hundred twenty-five thousand, seventy-one".