31542720913 has 8 divisors (see below), whose sum is σ = 34456562496. Its totient is φ = 28636599600.

The previous prime is 31542720889. The next prime is 31542720919. The reversal of 31542720913 is 31902724513.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-31542720913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31542720919) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1921518 + ... + 1937863.

It is an arithmetic number, because the mean of its divisors is an integer number (4307070312).

Almost surely, 2^31542720913 is an apocalyptic number.

It is an amenable number.

31542720913 is a deficient number, since it is larger than the sum of its proper divisors (2913841583).

31542720913 is a wasteful number, since it uses less digits than its factorization.

31542720913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3860135.

The product of its (nonzero) digits is 45360, while the sum is 37.

The spelling of 31542720913 in words is "thirty-one billion, five hundred forty-two million, seven hundred twenty thousand, nine hundred thirteen".