30799561391 has 4 divisors (see below), whose sum is σ = 30800071032. Its totient is φ = 30799051752.

The previous prime is 30799561381. The next prime is 30799561427. The reversal of 30799561391 is 19316599703.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30799561391 is a prime.

It is a super-2 number, since 2×30799561391² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30799561321) 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, 149720 + ... + 289853.

It is an arithmetic number, because the mean of its divisors is an integer number (7700017758).

Almost surely, 2^30799561391 is an apocalyptic number.

30799561391 is a deficient number, since it is larger than the sum of its proper divisors (509641).

30799561391 is an equidigital number, since it uses as much as digits as its factorization.

30799561391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509640.

The product of its (nonzero) digits is 1377810, while the sum is 53.

The spelling of 30799561391 in words is "thirty billion, seven hundred ninety-nine million, five hundred sixty-one thousand, three hundred ninety-one".