155397149 has 2 divisors, whose sum is σ = 155397150. Its totient is φ = 155397148.

The previous prime is 155397127. The next prime is 155397199. The reversal of 155397149 is 941793551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 148401124 + 6996025 = 12182^2 + 2645^2 .

It is a cyclic number.

It is not a de Polignac number, because 155397149 - 2¹⁶ = 155331613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (155397199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77698574 + 77698575.

It is an arithmetic number, because the mean of its divisors is an integer number (77698575).

Almost surely, 2^155397149 is an apocalyptic number.

It is an amenable number.

155397149 is a deficient number, since it is larger than the sum of its proper divisors (1).

155397149 is an equidigital number, since it uses as much as digits as its factorization.

155397149 is an evil number, because the sum of its binary digits is even.

The product of its digits is 170100, while the sum is 44.

The square root of 155397149 is about 12465.8392818133. The cubic root of 155397149 is about 537.6269311909.

The spelling of 155397149 in words is "one hundred fifty-five million, three hundred ninety-seven thousand, one hundred forty-nine".