30920131 has 4 divisors (see below), whose sum is σ = 33731064. Its totient is φ = 28109200.

The previous prime is 30920089. The next prime is 30920137. The reversal of 30920131 is 13102903.

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-30920131 is a prime.

It is a super-2 number, since 2×30920131² = 1912109002114322, 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 = 30920099 and 30920108.

It is not an unprimeable number, because it can be changed into a prime (30920137) 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, 1405450 + ... + 1405471.

It is an arithmetic number, because the mean of its divisors is an integer number (8432766).

Almost surely, 2^30920131 is an apocalyptic number.

30920131 is a deficient number, since it is larger than the sum of its proper divisors (2810933).

30920131 is a wasteful number, since it uses less digits than its factorization.

30920131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2810932.

The product of its (nonzero) digits is 162, while the sum is 19.

The square root of 30920131 is about 5560.5872891269. The cubic root of 30920131 is about 313.8680494177.

The spelling of 30920131 in words is "thirty million, nine hundred twenty thousand, one hundred thirty-one".