155156409 has 12 divisors (see below), whose sum is σ = 231843300. Its totient is φ = 99870624.

The previous prime is 155156401. The next prime is 155156411. The reversal of 155156409 is 904651551.

155156409 is a `hidden beast` number, since 1 + 5 + 5 + 1 + 5 + 640 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 67322025 + 87834384 = 8205^2 + 9372^2 .

It is not a de Polignac number, because 155156409 - 2³ = 155156401 is a prime.

It is a super-2 number, since 2×155156409² = 48147022507550562, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (155156401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 296974 + ... + 297495.

It is an arithmetic number, because the mean of its divisors is an integer number (19320275).

Almost surely, 2^155156409 is an apocalyptic number.

It is an amenable number.

155156409 is a deficient number, since it is larger than the sum of its proper divisors (76686891).

155156409 is a wasteful number, since it uses less digits than its factorization.

155156409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 594504 (or 594501 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The square root of 155156409 is about 12456.1795507290. The cubic root of 155156409 is about 537.3491586100.

The spelling of 155156409 in words is "one hundred fifty-five million, one hundred fifty-six thousand, four hundred nine".