231505159 has 2 divisors, whose sum is σ = 231505160. Its totient is φ = 231505158.

The previous prime is 231505123. The next prime is 231505171. The reversal of 231505159 is 951505132.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231505159 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 231505159.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231505259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115752579 + 115752580.

It is an arithmetic number, because the mean of its divisors is an integer number (115752580).

Almost surely, 2^231505159 is an apocalyptic number.

231505159 is a deficient number, since it is larger than the sum of its proper divisors (1).

231505159 is an equidigital number, since it uses as much as digits as its factorization.

231505159 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6750, while the sum is 31.

The square root of 231505159 is about 15215.2935890176. The cubic root of 231505159 is about 614.0261839534.

The spelling of 231505159 in words is "two hundred thirty-one million, five hundred five thousand, one hundred fifty-nine".