155663231 has 2 divisors, whose sum is σ = 155663232. Its totient is φ = 155663230.

The previous prime is 155663191. The next prime is 155663243. The reversal of 155663231 is 132366551.

It is a strong prime.

It is an emirp because it is prime and its reverse (132366551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 155663231 - 2²² = 151468927 is a prime.

It is a super-2 number, since 2×155663231² = 48462082970718722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155663251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77831615 + 77831616.

It is an arithmetic number, because the mean of its divisors is an integer number (77831616).

Almost surely, 2^155663231 is an apocalyptic number.

155663231 is a deficient number, since it is larger than the sum of its proper divisors (1).

155663231 is an equidigital number, since it uses as much as digits as its factorization.

155663231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16200, while the sum is 32.

The square root of 155663231 is about 12476.5071634653. The cubic root of 155663231 is about 537.9336105159.

The spelling of 155663231 in words is "one hundred fifty-five million, six hundred sixty-three thousand, two hundred thirty-one".