161589929 has 2 divisors, whose sum is σ = 161589930. Its totient is φ = 161589928.

The previous prime is 161589917. The next prime is 161589931. The reversal of 161589929 is 929985161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 160706329 + 883600 = 12677^2 + 940^2 .

It is a cyclic number.

It is not a de Polignac number, because 161589929 - 2¹⁶ = 161524393 is a prime.

It is a super-2 number, since 2×161589929² = 52222610308450082, which contains 22 as substring.

Together with 161589931, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (161589229) 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, 80794964 + 80794965.

It is an arithmetic number, because the mean of its divisors is an integer number (80794965).

Almost surely, 2^161589929 is an apocalyptic number.

It is an amenable number.

161589929 is a deficient number, since it is larger than the sum of its proper divisors (1).

161589929 is an equidigital number, since it uses as much as digits as its factorization.

161589929 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 349920, while the sum is 50.

The square root of 161589929 is about 12711.8027439069. The cubic root of 161589929 is about 544.6758210124.

The spelling of 161589929 in words is "one hundred sixty-one million, five hundred eighty-nine thousand, nine hundred twenty-nine".