30813131 has 2 divisors, whose sum is σ = 30813132. Its totient is φ = 30813130.

The previous prime is 30813091. The next prime is 30813137. The reversal of 30813131 is 13131803.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 30813131 - 2⁶ = 30813067 is a prime.

It is a super-2 number, since 2×30813131² = 1898898084046322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (30813137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15406565 + 15406566.

It is an arithmetic number, because the mean of its divisors is an integer number (15406566).

Almost surely, 2^30813131 is an apocalyptic number.

30813131 is a deficient number, since it is larger than the sum of its proper divisors (1).

30813131 is an equidigital number, since it uses as much as digits as its factorization.

30813131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 30813131 is about 5550.9576651241. The cubic root of 30813131 is about 313.5055811899.

Adding to 30813131 its reverse (13131803), we get a palindrome (43944934).

The spelling of 30813131 in words is "thirty million, eight hundred thirteen thousand, one hundred thirty-one".