168131291 has 2 divisors, whose sum is σ = 168131292. Its totient is φ = 168131290.

The previous prime is 168131281. The next prime is 168131387. The reversal of 168131291 is 192131861.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168131291 is a prime.

It is not a weakly prime, because it can be changed into another prime (168131281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84065645 + 84065646.

It is an arithmetic number, because the mean of its divisors is an integer number (84065646).

Almost surely, 2^168131291 is an apocalyptic number.

168131291 is a deficient number, since it is larger than the sum of its proper divisors (1).

168131291 is an equidigital number, since it uses as much as digits as its factorization.

168131291 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 168131291 is about 12966.5450679817. The cubic root of 168131291 is about 551.9285367036.

The spelling of 168131291 in words is "one hundred sixty-eight million, one hundred thirty-one thousand, two hundred ninety-one".