156972811 has 2 divisors, whose sum is σ = 156972812. Its totient is φ = 156972810.

The previous prime is 156972787. The next prime is 156972847. The reversal of 156972811 is 118279651.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 156972811 - 2⁵ = 156972779 is a prime.

It is not a weakly prime, because it can be changed into another prime (156970811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78486405 + 78486406.

It is an arithmetic number, because the mean of its divisors is an integer number (78486406).

Almost surely, 2^156972811 is an apocalyptic number.

156972811 is a deficient number, since it is larger than the sum of its proper divisors (1).

156972811 is an equidigital number, since it uses as much as digits as its factorization.

156972811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 40.

The square root of 156972811 is about 12528.8790799497. The cubic root of 156972811 is about 539.4379279597.

The spelling of 156972811 in words is "one hundred fifty-six million, nine hundred seventy-two thousand, eight hundred eleven".