161289131 has 2 divisors, whose sum is σ = 161289132. Its totient is φ = 161289130.

The previous prime is 161289127. The next prime is 161289137. The reversal of 161289131 is 131982161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161289131 - 2² = 161289127 is a prime.

It is a super-2 number, since 2×161289131² = 52028367557470322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (161289137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80644565 + 80644566.

It is an arithmetic number, because the mean of its divisors is an integer number (80644566).

Almost surely, 2^161289131 is an apocalyptic number.

161289131 is a deficient number, since it is larger than the sum of its proper divisors (1).

161289131 is an equidigital number, since it uses as much as digits as its factorization.

161289131 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2592, while the sum is 32.

The square root of 161289131 is about 12699.9657873555. The cubic root of 161289131 is about 544.3376415965.

The spelling of 161289131 in words is "one hundred sixty-one million, two hundred eighty-nine thousand, one hundred thirty-one".