155898979 has 2 divisors, whose sum is σ = 155898980. Its totient is φ = 155898978.

The previous prime is 155898961. The next prime is 155899021. The reversal of 155898979 is 979898551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 155898979 - 2¹¹ = 155896931 is a prime.

It is not a weakly prime, because it can be changed into another prime (155898929) 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, 77949489 + 77949490.

It is an arithmetic number, because the mean of its divisors is an integer number (77949490).

Almost surely, 2^155898979 is an apocalyptic number.

155898979 is a deficient number, since it is larger than the sum of its proper divisors (1).

155898979 is an equidigital number, since it uses as much as digits as its factorization.

155898979 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8164800, while the sum is 61.

The square root of 155898979 is about 12485.9512653222. The cubic root of 155898979 is about 538.2050357920.

The spelling of 155898979 in words is "one hundred fifty-five million, eight hundred ninety-eight thousand, nine hundred seventy-nine".