22601581 has 2 divisors, whose sum is σ = 22601582. Its totient is φ = 22601580.

The previous prime is 22601569. The next prime is 22601587. The reversal of 22601581 is 18510622.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19660356 + 2941225 = 4434^2 + 1715^2 .

It is a cyclic number.

It is not a de Polignac number, because 22601581 - 2⁵ = 22601549 is a prime.

It is a super-2 number, since 2×22601581² = 1021662927399122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22601587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11300790 + 11300791.

It is an arithmetic number, because the mean of its divisors is an integer number (11300791).

Almost surely, 2^22601581 is an apocalyptic number.

It is an amenable number.

22601581 is a deficient number, since it is larger than the sum of its proper divisors (1).

22601581 is an equidigital number, since it uses as much as digits as its factorization.

22601581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 22601581 is about 4754.1120096186. The cubic root of 22601581 is about 282.7350214855.

The spelling of 22601581 in words is "twenty-two million, six hundred one thousand, five hundred eighty-one".