22161597 has 8 divisors (see below), whose sum is σ = 30567840. Its totient is φ = 14264880.

The previous prime is 22161577. The next prime is 22161599. The reversal of 22161597 is 79516122.

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

It is not a de Polignac number, because 22161597 - 2⁶ = 22161533 is a prime.

It is a super-2 number, since 2×22161597² = 982272763180818, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22161599) 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, 127279 + ... + 127452.

It is an arithmetic number, because the mean of its divisors is an integer number (3820980).

Almost surely, 2^22161597 is an apocalyptic number.

It is an amenable number.

22161597 is a deficient number, since it is larger than the sum of its proper divisors (8406243).

22161597 is a wasteful number, since it uses less digits than its factorization.

22161597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254763.

The product of its digits is 7560, while the sum is 33.

The square root of 22161597 is about 4707.6105403910. The cubic root of 22161597 is about 280.8883224529. Note that the first 3 decimals are identical.

The spelling of 22161597 in words is "twenty-two million, one hundred sixty-one thousand, five hundred ninety-seven".