162591881 has 2 divisors, whose sum is σ = 162591882. Its totient is φ = 162591880.

The previous prime is 162591857. The next prime is 162591887. The reversal of 162591881 is 188195261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 161290000 + 1301881 = 12700^2 + 1141^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-162591881 is a prime.

It is a super-2 number, since 2×162591881² = 52872239534236322, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (162591887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81295940 + 81295941.

It is an arithmetic number, because the mean of its divisors is an integer number (81295941).

Almost surely, 2^162591881 is an apocalyptic number.

It is an amenable number.

162591881 is a deficient number, since it is larger than the sum of its proper divisors (1).

162591881 is an equidigital number, since it uses as much as digits as its factorization.

162591881 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34560, while the sum is 41.

The square root of 162591881 is about 12751.1521440221. The cubic root of 162591881 is about 545.7992716594.

The spelling of 162591881 in words is "one hundred sixty-two million, five hundred ninety-one thousand, eight hundred eighty-one".