156916391 has 2 divisors, whose sum is σ = 156916392. Its totient is φ = 156916390.

The previous prime is 156916379. The next prime is 156916427. The reversal of 156916391 is 193619651.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-156916391 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (156916091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78458195 + 78458196.

It is an arithmetic number, because the mean of its divisors is an integer number (78458196).

Almost surely, 2^156916391 is an apocalyptic number.

156916391 is a deficient number, since it is larger than the sum of its proper divisors (1).

156916391 is an equidigital number, since it uses as much as digits as its factorization.

156916391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43740, while the sum is 41.

The square root of 156916391 is about 12526.6272795194. The cubic root of 156916391 is about 539.3732910016.

The spelling of 156916391 in words is "one hundred fifty-six million, nine hundred sixteen thousand, three hundred ninety-one".