155571089 has 2 divisors, whose sum is σ = 155571090. Its totient is φ = 155571088.

The previous prime is 155571067. The next prime is 155571127. The reversal of 155571089 is 980175551.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 113060689 + 42510400 = 10633^2 + 6520^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-155571089 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (155571989) 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, 77785544 + 77785545.

It is an arithmetic number, because the mean of its divisors is an integer number (77785545).

Almost surely, 2^155571089 is an apocalyptic number.

It is an amenable number.

155571089 is a deficient number, since it is larger than the sum of its proper divisors (1).

155571089 is an equidigital number, since it uses as much as digits as its factorization.

155571089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63000, while the sum is 41.

The square root of 155571089 is about 12472.8139968493. The cubic root of 155571089 is about 537.8274495820.

The spelling of 155571089 in words is "one hundred fifty-five million, five hundred seventy-one thousand, eighty-nine".