155799251 has 2 divisors, whose sum is σ = 155799252. Its totient is φ = 155799250.

The previous prime is 155799247. The next prime is 155799257. The reversal of 155799251 is 152997551.

155799251 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 155799251 - 2² = 155799247 is a prime.

It is a super-2 number, since 2×155799251² = 48546813224322002, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (155799257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77899625 + 77899626.

It is an arithmetic number, because the mean of its divisors is an integer number (77899626).

Almost surely, 2^155799251 is an apocalyptic number.

155799251 is a deficient number, since it is larger than the sum of its proper divisors (1).

155799251 is an equidigital number, since it uses as much as digits as its factorization.

155799251 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 155799251 is about 12481.9570180321. The cubic root of 155799251 is about 538.0902487223.

The spelling of 155799251 in words is "one hundred fifty-five million, seven hundred ninety-nine thousand, two hundred fifty-one".