155988199 has 2 divisors, whose sum is σ = 155988200. Its totient is φ = 155988198.

The previous prime is 155988191. The next prime is 155988223. The reversal of 155988199 is 991889551.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 155988199 - 2³ = 155988191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155988191) 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, 77994099 + 77994100.

It is an arithmetic number, because the mean of its divisors is an integer number (77994100).

Almost surely, 2^155988199 is an apocalyptic number.

155988199 is a deficient number, since it is larger than the sum of its proper divisors (1).

155988199 is an equidigital number, since it uses as much as digits as its factorization.

155988199 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1166400, while the sum is 55.

The square root of 155988199 is about 12489.5235697764. The cubic root of 155988199 is about 538.3076866587.

The spelling of 155988199 in words is "one hundred fifty-five million, nine hundred eighty-eight thousand, one hundred ninety-nine".