22597981 has 16 divisors (see below), whose sum is σ = 27869184. Its totient is φ = 17881344.

The previous prime is 22597969. The next prime is 22597987. The reversal of 22597981 is 18979522.

It is a cyclic number.

It is not a de Polignac number, because 22597981 - 2¹¹ = 22595933 is a prime.

It is a super-2 number, since 2×22597981² = 1021337490552722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22597987) 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, 4516 + ... + 8098.

It is an arithmetic number, because the mean of its divisors is an integer number (1741824).

Almost surely, 2^22597981 is an apocalyptic number.

It is an amenable number.

22597981 is a deficient number, since it is larger than the sum of its proper divisors (5271203).

22597981 is a wasteful number, since it uses less digits than its factorization.

22597981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3660.

The product of its digits is 90720, while the sum is 43.

The square root of 22597981 is about 4753.7333749381. The cubic root of 22597981 is about 282.7200092595.

The spelling of 22597981 in words is "twenty-two million, five hundred ninety-seven thousand, nine hundred eighty-one".