161422577 has 8 divisors (see below), whose sum is σ = 165580200. Its totient is φ = 157306240.

The previous prime is 161422567. The next prime is 161422589. The reversal of 161422577 is 775224161.

It can be written as a sum of positive squares in 4 ways, for example, as 34093921 + 127328656 = 5839^2 + 11284^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161422577 - 2⁴ = 161422561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161422567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2324 + ... + 18117.

It is an arithmetic number, because the mean of its divisors is an integer number (20697525).

Almost surely, 2^161422577 is an apocalyptic number.

It is an amenable number.

161422577 is a deficient number, since it is larger than the sum of its proper divisors (4157623).

161422577 is a wasteful number, since it uses less digits than its factorization.

161422577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20643.

The product of its digits is 23520, while the sum is 35.

The square root of 161422577 is about 12705.2184947761. The cubic root of 161422577 is about 544.4877233293.

The spelling of 161422577 in words is "one hundred sixty-one million, four hundred twenty-two thousand, five hundred seventy-seven".