22626581 has 2 divisors, whose sum is σ = 22626582. Its totient is φ = 22626580.

The previous prime is 22626563. The next prime is 22626589. The reversal of 22626581 is 18562622.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22515025 + 111556 = 4745^2 + 334^2 .

It is a cyclic number.

It is not a de Polignac number, because 22626581 - 2¹⁰ = 22625557 is a prime.

It is a super-2 number, since 2×22626581² = 1023924335499122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22626589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11313290 + 11313291.

It is an arithmetic number, because the mean of its divisors is an integer number (11313291).

Almost surely, 2^22626581 is an apocalyptic number.

It is an amenable number.

22626581 is a deficient number, since it is larger than the sum of its proper divisors (1).

22626581 is an equidigital number, since it uses as much as digits as its factorization.

22626581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11520, while the sum is 32.

The square root of 22626581 is about 4756.7405857373. The cubic root of 22626581 is about 282.8392291068.

The spelling of 22626581 in words is "twenty-two million, six hundred twenty-six thousand, five hundred eighty-one".