155515013 has 2 divisors, whose sum is σ = 155515014. Its totient is φ = 155515012.

The previous prime is 155514967. The next prime is 155515027. The reversal of 155515013 is 310515551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 131377444 + 24137569 = 11462^2 + 4913^2 .

It is a cyclic number.

It is not a de Polignac number, because 155515013 - 2⁸ = 155514757 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155515093) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77757506 + 77757507.

It is an arithmetic number, because the mean of its divisors is an integer number (77757507).

Almost surely, 2^155515013 is an apocalyptic number.

It is an amenable number.

155515013 is a deficient number, since it is larger than the sum of its proper divisors (1).

155515013 is an equidigital number, since it uses as much as digits as its factorization.

155515013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1875, while the sum is 26.

The square root of 155515013 is about 12470.5658652685. The cubic root of 155515013 is about 537.7628213862.

The spelling of 155515013 in words is "one hundred fifty-five million, five hundred fifteen thousand, thirteen".