30133931 has 4 divisors (see below), whose sum is σ = 30170112. Its totient is φ = 30097752.

The previous prime is 30133921. The next prime is 30133937. The reversal of 30133931 is 13933103.

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-30133931 is a prime.

It is a super-2 number, since 2×30133931² = 1816107595025522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30133897 and 30133906.

It is not an unprimeable number, because it can be changed into a prime (30133937) 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, 16811 + ... + 18516.

It is an arithmetic number, because the mean of its divisors is an integer number (7542528).

Almost surely, 2^30133931 is an apocalyptic number.

30133931 is a deficient number, since it is larger than the sum of its proper divisors (36181).

30133931 is an equidigital number, since it uses as much as digits as its factorization.

30133931 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36180.

The product of its (nonzero) digits is 729, while the sum is 23.

The square root of 30133931 is about 5489.4381315395. The cubic root of 30133931 is about 311.1849583721.

The spelling of 30133931 in words is "thirty million, one hundred thirty-three thousand, nine hundred thirty-one".