22597681 has 4 divisors (see below), whose sum is σ = 22663152. Its totient is φ = 22532212.

The previous prime is 22597613. The next prime is 22597691. The reversal of 22597681 is 18679522.

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: 18679522 = 2 ⋅9339761.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22597681 is a prime.

It is a super-2 number, since 2×22597681² = 1021310373155522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22597691) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32215 + ... + 32908.

It is an arithmetic number, because the mean of its divisors is an integer number (5665788).

Almost surely, 2^22597681 is an apocalyptic number.

It is an amenable number.

22597681 is a deficient number, since it is larger than the sum of its proper divisors (65471).

22597681 is an equidigital number, since it uses as much as digits as its factorization.

22597681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65470.

The product of its digits is 60480, while the sum is 40.

The square root of 22597681 is about 4753.7018206867. The cubic root of 22597681 is about 282.7187581687.

The spelling of 22597681 in words is "twenty-two million, five hundred ninety-seven thousand, six hundred eighty-one".