161574089 has 2 divisors, whose sum is σ = 161574090. Its totient is φ = 161574088.

The previous prime is 161574073. The next prime is 161574097. The reversal of 161574089 is 980475161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 161290000 + 284089 = 12700^2 + 533^2 .

It is a cyclic number.

It is not a de Polignac number, because 161574089 - 2⁴ = 161574073 is a prime.

It is a super-2 number, since 2×161574089² = 52212372472359842, which contains 22 as substring.

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 (161574019) 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, 80787044 + 80787045.

It is an arithmetic number, because the mean of its divisors is an integer number (80787045).

Almost surely, 2^161574089 is an apocalyptic number.

It is an amenable number.

161574089 is a deficient number, since it is larger than the sum of its proper divisors (1).

161574089 is an equidigital number, since it uses as much as digits as its factorization.

161574089 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 41.

The square root of 161574089 is about 12711.1796856153. The cubic root of 161574089 is about 544.6580229830.

The spelling of 161574089 in words is "one hundred sixty-one million, five hundred seventy-four thousand, eighty-nine".