22597381 has 2 divisors, whose sum is σ = 22597382. Its totient is φ = 22597380.

The previous prime is 22597373. The next prime is 22597387. The reversal of 22597381 is 18379522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20520900 + 2076481 = 4530^2 + 1441^2 .

It is a cyclic number.

It is not a de Polignac number, because 22597381 - 2³ = 22597373 is a prime.

It is a super-2 number, since 2×22597381² = 1021283256118322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 22597381.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22597387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11298690 + 11298691.

It is an arithmetic number, because the mean of its divisors is an integer number (11298691).

Almost surely, 2^22597381 is an apocalyptic number.

It is an amenable number.

22597381 is a deficient number, since it is larger than the sum of its proper divisors (1).

22597381 is an equidigital number, since it uses as much as digits as its factorization.

22597381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 37.

The square root of 22597381 is about 4753.6702662259. The cubic root of 22597381 is about 282.7175070668.

The spelling of 22597381 in words is "twenty-two million, five hundred ninety-seven thousand, three hundred eighty-one".