30797991 has 24 divisors (see below), whose sum is σ = 51003680. Its totient is φ = 17542656.

The previous prime is 30797959. The next prime is 30798013. The reversal of 30797991 is 19979703.

It is not a de Polignac number, because 30797991 - 2⁵ = 30797959 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30797891) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26715 + ... + 27843.

Almost surely, 2^30797991 is an apocalyptic number.

30797991 is a deficient number, since it is larger than the sum of its proper divisors (20205689).

30797991 is a wasteful number, since it uses less digits than its factorization.

30797991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1575 (or 1572 counting only the distinct ones).

The product of its (nonzero) digits is 107163, while the sum is 45.

The square root of 30797991 is about 5549.5937689168. The cubic root of 30797991 is about 313.4542258970.

The spelling of 30797991 in words is "thirty million, seven hundred ninety-seven thousand, nine hundred ninety-one".