162155891 has 2 divisors, whose sum is σ = 162155892. Its totient is φ = 162155890.

The previous prime is 162155857. The next prime is 162155893. The reversal of 162155891 is 198551261.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-162155891 is a prime.

It is a Sophie Germain prime.

Together with 162155893, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (162155893) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81077945 + 81077946.

It is an arithmetic number, because the mean of its divisors is an integer number (81077946).

Almost surely, 2^162155891 is an apocalyptic number.

162155891 is a deficient number, since it is larger than the sum of its proper divisors (1).

162155891 is an equidigital number, since it uses as much as digits as its factorization.

162155891 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21600, while the sum is 38.

The square root of 162155891 is about 12734.0445656516. The cubic root of 162155891 is about 545.3109815110.

The spelling of 162155891 in words is "one hundred sixty-two million, one hundred fifty-five thousand, eight hundred ninety-one".