155970251 has 2 divisors, whose sum is σ = 155970252. Its totient is φ = 155970250.

The previous prime is 155970203. The next prime is 155970263. The reversal of 155970251 is 152079551.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 155970251 - 2¹⁴ = 155953867 is a prime.

It is not a weakly prime, because it can be changed into another prime (155972251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77985125 + 77985126.

It is an arithmetic number, because the mean of its divisors is an integer number (77985126).

Almost surely, 2^155970251 is an apocalyptic number.

155970251 is a deficient number, since it is larger than the sum of its proper divisors (1).

155970251 is an equidigital number, since it uses as much as digits as its factorization.

155970251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15750, while the sum is 35.

The square root of 155970251 is about 12488.8050269031. The cubic root of 155970251 is about 538.2870399752.

The spelling of 155970251 in words is "one hundred fifty-five million, nine hundred seventy thousand, two hundred fifty-one".