161668931 has 2 divisors, whose sum is σ = 161668932. Its totient is φ = 161668930.

The previous prime is 161668919. The next prime is 161668961. The reversal of 161668931 is 139866161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161668931 - 2⁶ = 161668867 is a prime.

It is a super-2 number, since 2×161668931² = 52273686501365522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (161668961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80834465 + 80834466.

It is an arithmetic number, because the mean of its divisors is an integer number (80834466).

Almost surely, 2^161668931 is an apocalyptic number.

161668931 is a deficient number, since it is larger than the sum of its proper divisors (1).

161668931 is an equidigital number, since it uses as much as digits as its factorization.

161668931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 46656, while the sum is 41.

The square root of 161668931 is about 12714.9097912647. The cubic root of 161668931 is about 544.7645713217.

The spelling of 161668931 in words is "one hundred sixty-one million, six hundred sixty-eight thousand, nine hundred thirty-one".