155123911 has 2 divisors, whose sum is σ = 155123912. Its totient is φ = 155123910.

The previous prime is 155123887. The next prime is 155123933. The reversal of 155123911 is 119321551.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 155123911 - 2⁵ = 155123879 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 155123911.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155123611) 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, 77561955 + 77561956.

It is an arithmetic number, because the mean of its divisors is an integer number (77561956).

Almost surely, 2^155123911 is an apocalyptic number.

155123911 is a deficient number, since it is larger than the sum of its proper divisors (1).

155123911 is an equidigital number, since it uses as much as digits as its factorization.

155123911 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1350, while the sum is 28.

The square root of 155123911 is about 12454.8749893365. The cubic root of 155123911 is about 537.3116394975.

The spelling of 155123911 in words is "one hundred fifty-five million, one hundred twenty-three thousand, nine hundred eleven".