30991929013 has 4 divisors (see below), whose sum is σ = 31197173728. Its totient is φ = 30786684300.

The previous prime is 30991928993. The next prime is 30991929037. The reversal of 30991929013 is 31092919903.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 30991929013 - 2⁹ = 30991928501 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 (30991929113) 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, 102622131 + ... + 102622432.

It is an arithmetic number, because the mean of its divisors is an integer number (7799293432).

Almost surely, 2^30991929013 is an apocalyptic number.

It is an amenable number.

30991929013 is a deficient number, since it is larger than the sum of its proper divisors (205244715).

30991929013 is a wasteful number, since it uses less digits than its factorization.

30991929013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205244714.

The product of its (nonzero) digits is 118098, while the sum is 46.

The spelling of 30991929013 in words is "thirty billion, nine hundred ninety-one million, nine hundred twenty-nine thousand, thirteen".