155881123 has 2 divisors, whose sum is σ = 155881124. Its totient is φ = 155881122.

The previous prime is 155881087. The next prime is 155881129. The reversal of 155881123 is 321188551.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 155881123 - 2¹³ = 155872931 is a prime.

It is a super-2 number, since 2×155881123² = 48597849015482258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (155881129) 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, 77940561 + 77940562.

It is an arithmetic number, because the mean of its divisors is an integer number (77940562).

Almost surely, 2^155881123 is an apocalyptic number.

155881123 is a deficient number, since it is larger than the sum of its proper divisors (1).

155881123 is an equidigital number, since it uses as much as digits as its factorization.

155881123 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9600, while the sum is 34.

The square root of 155881123 is about 12485.2362012098. The cubic root of 155881123 is about 538.1844871091.

The spelling of 155881123 in words is "one hundred fifty-five million, eight hundred eighty-one thousand, one hundred twenty-three".