155918923 has 2 divisors, whose sum is σ = 155918924. Its totient is φ = 155918922.

The previous prime is 155918899. The next prime is 155918927. The reversal of 155918923 is 329819551.

It is a happy number.

It is a strong prime.

It is an emirp because it is prime and its reverse (329819551) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155918923 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 155918923.

It is not a weakly prime, because it can be changed into another prime (155918927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77959461 + 77959462.

It is an arithmetic number, because the mean of its divisors is an integer number (77959462).

Almost surely, 2^155918923 is an apocalyptic number.

155918923 is a deficient number, since it is larger than the sum of its proper divisors (1).

155918923 is an equidigital number, since it uses as much as digits as its factorization.

155918923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 97200, while the sum is 43.

The square root of 155918923 is about 12486.7498973912. The cubic root of 155918923 is about 538.2279854902.

The spelling of 155918923 in words is "one hundred fifty-five million, nine hundred eighteen thousand, nine hundred twenty-three".