30791 has 4 divisors (see below), whose sum is σ = 31584. Its totient is φ = 30000.

The previous prime is 30781. The next prime is 30803. The reversal of 30791 is 19703.

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

It is a cyclic number.

It is not a de Polignac number, because 30791 - 2⁶ = 30727 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30781) 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, 335 + ... + 416.

It is an arithmetic number, because the mean of its divisors is an integer number (7896).

2³⁰⁷⁹¹ is an apocalyptic number.

30791 is a deficient number, since it is larger than the sum of its proper divisors (793).

30791 is an equidigital number, since it uses as much as digits as its factorization.

30791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792.

The product of its (nonzero) digits is 189, while the sum is 20.

The square root of 30791 is about 175.4736447447. The cubic root of 30791 is about 31.3430506554.

The spelling of 30791 in words is "thirty thousand, seven hundred ninety-one".