155764409 has 2 divisors, whose sum is σ = 155764410. Its totient is φ = 155764408.

The previous prime is 155764397. The next prime is 155764459. The reversal of 155764409 is 904467551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140185600 + 15578809 = 11840^2 + 3947^2 .

It is a cyclic number.

It is not a de Polignac number, because 155764409 - 2⁴ = 155764393 is a prime.

It is a super-2 number, since 2×155764409² = 48525102222238562, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (155764459) 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, 77882204 + 77882205.

It is an arithmetic number, because the mean of its divisors is an integer number (77882205).

Almost surely, 2^155764409 is an apocalyptic number.

It is an amenable number.

155764409 is a deficient number, since it is larger than the sum of its proper divisors (1).

155764409 is an equidigital number, since it uses as much as digits as its factorization.

155764409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 151200, while the sum is 41.

The square root of 155764409 is about 12480.5612453928. The cubic root of 155764409 is about 538.0501339847.

The spelling of 155764409 in words is "one hundred fifty-five million, seven hundred sixty-four thousand, four hundred nine".