162156391 has 2 divisors, whose sum is σ = 162156392. Its totient is φ = 162156390.

The previous prime is 162156377. The next prime is 162156419. The reversal of 162156391 is 193651261.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 162156391 - 2⁵ = 162156359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (162156331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81078195 + 81078196.

It is an arithmetic number, because the mean of its divisors is an integer number (81078196).

Almost surely, 2^162156391 is an apocalyptic number.

162156391 is a deficient number, since it is larger than the sum of its proper divisors (1).

162156391 is an equidigital number, since it uses as much as digits as its factorization.

162156391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9720, while the sum is 34.

The square root of 162156391 is about 12734.0641980477. The cubic root of 162156391 is about 545.3115419906.

The spelling of 162156391 in words is "one hundred sixty-two million, one hundred fifty-six thousand, three hundred ninety-one".