22609861 has 2 divisors, whose sum is σ = 22609862. Its totient is φ = 22609860.

The previous prime is 22609859. The next prime is 22609871. The reversal of 22609861 is 16890622.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13549761 + 9060100 = 3681^2 + 3010^2 .

It is a cyclic number.

It is not a de Polignac number, because 22609861 - 2¹ = 22609859 is a prime.

It is a super-2 number, since 2×22609861² = 1022411628878642, which contains 22 as substring.

Together with 22609859, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22609841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11304930 + 11304931.

It is an arithmetic number, because the mean of its divisors is an integer number (11304931).

Almost surely, 2^22609861 is an apocalyptic number.

It is an amenable number.

22609861 is a deficient number, since it is larger than the sum of its proper divisors (1).

22609861 is an equidigital number, since it uses as much as digits as its factorization.

22609861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 22609861 is about 4754.9827549635. The cubic root of 22609861 is about 282.7695435566.

It can be divided in two parts, 2260 and 9861, that added together give a palindrome (12121).

The spelling of 22609861 in words is "twenty-two million, six hundred nine thousand, eight hundred sixty-one".