156168997 has 2 divisors, whose sum is σ = 156168998. Its totient is φ = 156168996.

The previous prime is 156168983. The next prime is 156169001. The reversal of 156168997 is 799861651.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 155725441 + 443556 = 12479^2 + 666^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-156168997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (156168697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78084498 + 78084499.

It is an arithmetic number, because the mean of its divisors is an integer number (78084499).

Almost surely, 2^156168997 is an apocalyptic number.

It is an amenable number.

156168997 is a deficient number, since it is larger than the sum of its proper divisors (1).

156168997 is an equidigital number, since it uses as much as digits as its factorization.

156168997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 816480, while the sum is 52.

The square root of 156168997 is about 12496.7594599560. The cubic root of 156168997 is about 538.5155813937.

The spelling of 156168997 in words is "one hundred fifty-six million, one hundred sixty-eight thousand, nine hundred ninety-seven".