231575987 has 2 divisors, whose sum is σ = 231575988. Its totient is φ = 231575986.

The previous prime is 231575951. The next prime is 231575999. The reversal of 231575987 is 789575132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231575987 - 2¹⁰ = 231574963 is a prime.

It is not a weakly prime, because it can be changed into another prime (231575917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115787993 + 115787994.

It is an arithmetic number, because the mean of its divisors is an integer number (115787994).

Almost surely, 2^231575987 is an apocalyptic number.

231575987 is a deficient number, since it is larger than the sum of its proper divisors (1).

231575987 is an equidigital number, since it uses as much as digits as its factorization.

231575987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 529200, while the sum is 47.

The square root of 231575987 is about 15217.6209375842. The cubic root of 231575987 is about 614.0887971183.

The spelling of 231575987 in words is "two hundred thirty-one million, five hundred seventy-five thousand, nine hundred eighty-seven".