231135187 has 2 divisors, whose sum is σ = 231135188. Its totient is φ = 231135186.

The previous prime is 231135169. The next prime is 231135199. The reversal of 231135187 is 781531132.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231135187 is a prime.

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, 115567593 + 115567594.

It is an arithmetic number, because the mean of its divisors is an integer number (115567594).

Almost surely, 2^231135187 is an apocalyptic number.

231135187 is a deficient number, since it is larger than the sum of its proper divisors (1).

231135187 is an equidigital number, since it uses as much as digits as its factorization.

231135187 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5040, while the sum is 31.

The square root of 231135187 is about 15203.1308288786. The cubic root of 231135187 is about 613.6989146176.

The spelling of 231135187 in words is "two hundred thirty-one million, one hundred thirty-five thousand, one hundred eighty-seven".