155025139 has 2 divisors, whose sum is σ = 155025140. Its totient is φ = 155025138.

The previous prime is 155025133. The next prime is 155025149. The reversal of 155025139 is 931520551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 155025139 - 2⁷ = 155025011 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 155025139.

It is not a weakly prime, because it can be changed into another prime (155025133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77512569 + 77512570.

It is an arithmetic number, because the mean of its divisors is an integer number (77512570).

Almost surely, 2^155025139 is an apocalyptic number.

155025139 is a deficient number, since it is larger than the sum of its proper divisors (1).

155025139 is an equidigital number, since it uses as much as digits as its factorization.

155025139 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6750, while the sum is 31.

The square root of 155025139 is about 12450.9091635912. The cubic root of 155025139 is about 537.1975745264.

The spelling of 155025139 in words is "one hundred fifty-five million, twenty-five thousand, one hundred thirty-nine".