155371231 has 2 divisors, whose sum is σ = 155371232. Its totient is φ = 155371230.

The previous prime is 155371219. The next prime is 155371243. The reversal of 155371231 is 132173551.

It is a balanced prime because it is at equal distance from previous prime (155371219) and next prime (155371243).

It is an emirp because it is prime and its reverse (132173551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 155371231 - 2⁵ = 155371199 is a prime.

It is a super-2 number, since 2×155371231² = 48280438844910722, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 155371231.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155371201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77685615 + 77685616.

It is an arithmetic number, because the mean of its divisors is an integer number (77685616).

Almost surely, 2^155371231 is an apocalyptic number.

155371231 is a deficient number, since it is larger than the sum of its proper divisors (1).

155371231 is an equidigital number, since it uses as much as digits as its factorization.

155371231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3150, while the sum is 28.

The square root of 155371231 is about 12464.7996774918. The cubic root of 155371231 is about 537.5970400600.

The spelling of 155371231 in words is "one hundred fifty-five million, three hundred seventy-one thousand, two hundred thirty-one".