161589937 has 2 divisors, whose sum is σ = 161589938. Its totient is φ = 161589936.

The previous prime is 161589931. The next prime is 161589991. The reversal of 161589937 is 739985161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 143065521 + 18524416 = 11961^2 + 4304^2 .

It is a cyclic number.

It is not a de Polignac number, because 161589937 - 2³ = 161589929 is a prime.

It is a super-2 number, since 2×161589937² = 52222615479327938, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161589931) 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, 80794968 + 80794969.

It is an arithmetic number, because the mean of its divisors is an integer number (80794969).

Almost surely, 2^161589937 is an apocalyptic number.

It is an amenable number.

161589937 is a deficient number, since it is larger than the sum of its proper divisors (1).

161589937 is an equidigital number, since it uses as much as digits as its factorization.

161589937 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 408240, while the sum is 49.

The square root of 161589937 is about 12711.8030585751. The cubic root of 161589937 is about 544.6758300010.

The spelling of 161589937 in words is "one hundred sixty-one million, five hundred eighty-nine thousand, nine hundred thirty-seven".