155397199 has 2 divisors, whose sum is σ = 155397200. Its totient is φ = 155397198.

The previous prime is 155397149. The next prime is 155397211. The reversal of 155397199 is 991793551.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 155397199 - 2¹³ = 155389007 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155397149) 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, 77698599 + 77698600.

It is an arithmetic number, because the mean of its divisors is an integer number (77698600).

Almost surely, 2^155397199 is an apocalyptic number.

155397199 is a deficient number, since it is larger than the sum of its proper divisors (1).

155397199 is an equidigital number, since it uses as much as digits as its factorization.

155397199 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 382725, while the sum is 49.

The square root of 155397199 is about 12465.8412872939. The cubic root of 155397199 is about 537.6269888525.

The spelling of 155397199 in words is "one hundred fifty-five million, three hundred ninety-seven thousand, one hundred ninety-nine".