155199257 has 2 divisors, whose sum is σ = 155199258. Its totient is φ = 155199256.

The previous prime is 155199251. The next prime is 155199259. The reversal of 155199257 is 752991551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 94109401 + 61089856 = 9701^2 + 7816^2 .

It is a cyclic number.

It is not a de Polignac number, because 155199257 - 2²⁰ = 154150681 is a prime.

Together with 155199259, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (155199251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77599628 + 77599629.

It is an arithmetic number, because the mean of its divisors is an integer number (77599629).

Almost surely, 2^155199257 is an apocalyptic number.

It is an amenable number.

155199257 is a deficient number, since it is larger than the sum of its proper divisors (1).

155199257 is an equidigital number, since it uses as much as digits as its factorization.

155199257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 141750, while the sum is 44.

The square root of 155199257 is about 12457.8993815169. The cubic root of 155199257 is about 537.3986188456.

The spelling of 155199257 in words is "one hundred fifty-five million, one hundred ninety-nine thousand, two hundred fifty-seven".