162121091 has 16 divisors (see below), whose sum is σ = 186831360. Its totient is φ = 139128480.

The previous prime is 162121067. The next prime is 162121111. The reversal of 162121091 is 190121261.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 162121091 - 2²⁶ = 95012227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (162121021) 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 in 15 ways as a sum of consecutive naturals, for example, 65030 + ... + 67476.

It is an arithmetic number, because the mean of its divisors is an integer number (11676960).

Almost surely, 2^162121091 is an apocalyptic number.

162121091 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

162121091 is a deficient number, since it is larger than the sum of its proper divisors (24710269).

162121091 is a wasteful number, since it uses less digits than its factorization.

162121091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2794.

The product of its (nonzero) digits is 216, while the sum is 23.

The square root of 162121091 is about 12732.6780765085. The cubic root of 162121091 is about 545.2719692993.

The spelling of 162121091 in words is "one hundred sixty-two million, one hundred twenty-one thousand, ninety-one".