30991713 has 8 divisors (see below), whose sum is σ = 41904576. Its totient is φ = 20370000.

The previous prime is 30991703. The next prime is 30991733. The reversal of 30991713 is 31719903.

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

It is not a de Polignac number, because 30991713 - 2¹⁰ = 30990689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (30991703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72538 + ... + 72963.

It is an arithmetic number, because the mean of its divisors is an integer number (5238072).

Almost surely, 2^30991713 is an apocalyptic number.

It is an amenable number.

30991713 is a deficient number, since it is larger than the sum of its proper divisors (10912863).

30991713 is a wasteful number, since it uses less digits than its factorization.

30991713 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145575.

The product of its (nonzero) digits is 5103, while the sum is 33.

The square root of 30991713 is about 5567.0201185194. The cubic root of 30991713 is about 314.1100706784.

The spelling of 30991713 in words is "thirty million, nine hundred ninety-one thousand, seven hundred thirteen".