161422081 has 4 divisors (see below), whose sum is σ = 169918000. Its totient is φ = 152926164.

The previous prime is 161422069. The next prime is 161422099. The reversal of 161422081 is 180224161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 180224161 = 13 ⋅13863397.

It is a cyclic number.

It is not a de Polignac number, because 161422081 - 2⁵ = 161422049 is a prime.

It is a super-2 number, since 2×161422081² = 52114176468741122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161422061) 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 3 ways as a sum of consecutive naturals, for example, 4247931 + ... + 4247968.

It is an arithmetic number, because the mean of its divisors is an integer number (42479500).

Almost surely, 2^161422081 is an apocalyptic number.

It is an amenable number.

161422081 is a deficient number, since it is larger than the sum of its proper divisors (8495919).

161422081 is an equidigital number, since it uses as much as digits as its factorization.

161422081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8495918.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 161422081 is about 12705.1989752227. The cubic root of 161422081 is about 544.4871656498.

The spelling of 161422081 in words is "one hundred sixty-one million, four hundred twenty-two thousand, eighty-one".