231135131 has 2 divisors, whose sum is σ = 231135132. Its totient is φ = 231135130.

The previous prime is 231135103. The next prime is 231135137. The reversal of 231135131 is 131531132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231135131 - 2¹⁸ = 230872987 is a prime.

It is a super-2 number, since 2×231135131² = 106846897564774322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (231135137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115567565 + 115567566.

It is an arithmetic number, because the mean of its divisors is an integer number (115567566).

Almost surely, 2^231135131 is an apocalyptic number.

231135131 is a deficient number, since it is larger than the sum of its proper divisors (1).

231135131 is an equidigital number, since it uses as much as digits as its factorization.

231135131 is an evil number, because the sum of its binary digits is even.

The product of its digits is 270, while the sum is 20.

The square root of 231135131 is about 15203.1289871526. The cubic root of 231135131 is about 613.6988650548.

Adding to 231135131 its reverse (131531132), we get a palindrome (362666263).

The spelling of 231135131 in words is "two hundred thirty-one million, one hundred thirty-five thousand, one hundred thirty-one".