31505315113 has 8 divisors (see below), whose sum is σ = 31995017280. Its totient is φ = 31019098800.

The previous prime is 31505315099. The next prime is 31505315117. The reversal of 31505315113 is 31151350513.

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-31505315113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31505315117) 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, 853245 + ... + 889402.

It is an arithmetic number, because the mean of its divisors is an integer number (3999377160).

Almost surely, 2^31505315113 is an apocalyptic number.

It is an amenable number.

31505315113 is a deficient number, since it is larger than the sum of its proper divisors (489702167).

31505315113 is a wasteful number, since it uses less digits than its factorization.

31505315113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1742927.

The product of its (nonzero) digits is 3375, while the sum is 28.

Adding to 31505315113 its reverse (31151350513), we get a palindrome (62656665626).

The spelling of 31505315113 in words is "thirty-one billion, five hundred five million, three hundred fifteen thousand, one hundred thirteen".