231987163 has 2 divisors, whose sum is σ = 231987164. Its totient is φ = 231987162.

The previous prime is 231987127. The next prime is 231987179. The reversal of 231987163 is 361789132.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 231987163 - 2¹⁷ = 231856091 is a prime.

It is not a weakly prime, because it can be changed into another prime (231987103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115993581 + 115993582.

It is an arithmetic number, because the mean of its divisors is an integer number (115993582).

Almost surely, 2^231987163 is an apocalyptic number.

231987163 is a deficient number, since it is larger than the sum of its proper divisors (1).

231987163 is an equidigital number, since it uses as much as digits as its factorization.

231987163 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 40.

The square root of 231987163 is about 15231.1248107289. The cubic root of 231987163 is about 614.4520317870.

The spelling of 231987163 in words is "two hundred thirty-one million, nine hundred eighty-seven thousand, one hundred sixty-three".