155916913 has 2 divisors, whose sum is σ = 155916914. Its totient is φ = 155916912.

The previous prime is 155916883. The next prime is 155916919. The reversal of 155916913 is 319619551.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129208689 + 26708224 = 11367^2 + 5168^2 .

It is an emirp because it is prime and its reverse (319619551) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 155916913 - 2²¹ = 153819761 is a prime.

It is not a weakly prime, because it can be changed into another prime (155916919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77958456 + 77958457.

It is an arithmetic number, because the mean of its divisors is an integer number (77958457).

Almost surely, 2^155916913 is an apocalyptic number.

It is an amenable number.

155916913 is a deficient number, since it is larger than the sum of its proper divisors (1).

155916913 is an equidigital number, since it uses as much as digits as its factorization.

155916913 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36450, while the sum is 40.

The square root of 155916913 is about 12486.6694118167. The cubic root of 155916913 is about 538.2256726580.

The spelling of 155916913 in words is "one hundred fifty-five million, nine hundred sixteen thousand, nine hundred thirteen".