155231 has 2 divisors, whose sum is σ = 155232. Its totient is φ = 155230.

The previous prime is 155219. The next prime is 155251. The reversal of 155231 is 132551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 155231 - 2⁶ = 155167 is a prime.

It is a super-2 number, since 2×155231² = 48193326722, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77615 + 77616.

It is an arithmetic number, because the mean of its divisors is an integer number (77616).

2¹⁵⁵²³¹ is an apocalyptic number.

155231 is a deficient number, since it is larger than the sum of its proper divisors (1).

155231 is an equidigital number, since it uses as much as digits as its factorization.

155231 is an evil number, because the sum of its binary digits is even.

The product of its digits is 150, while the sum is 17.

The square root of 155231 is about 393.9936547712. The cubic root of 155231 is about 53.7435254505.

Adding to 155231 its reverse (132551), we get a palindrome (287782).

The spelling of 155231 in words is "one hundred fifty-five thousand, two hundred thirty-one".