22140581 has 2 divisors, whose sum is σ = 22140582. Its totient is φ = 22140580.

The previous prime is 22140577. The next prime is 22140617. The reversal of 22140581 is 18504122.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21390625 + 749956 = 4625^2 + 866^2 .

It is a cyclic number.

It is not a de Polignac number, because 22140581 - 2² = 22140577 is a prime.

It is a super-2 number, since 2×22140581² = 980410654035122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen 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 (22110581) 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 as a sum of consecutive naturals, namely, 11070290 + 11070291.

It is an arithmetic number, because the mean of its divisors is an integer number (11070291).

Almost surely, 2^22140581 is an apocalyptic number.

It is an amenable number.

22140581 is a deficient number, since it is larger than the sum of its proper divisors (1).

22140581 is an equidigital number, since it uses as much as digits as its factorization.

22140581 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 22140581 is about 4705.3778806808. The cubic root of 22140581 is about 280.7995049071.

The spelling of 22140581 in words is "twenty-two million, one hundred forty thousand, five hundred eighty-one".