22660381 has 2 divisors, whose sum is σ = 22660382. Its totient is φ = 22660380.

The previous prime is 22660373. The next prime is 22660399. The reversal of 22660381 is 18306622.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15531481 + 7128900 = 3941^2 + 2670^2 .

It is a cyclic number.

It is not a de Polignac number, because 22660381 - 2³ = 22660373 is a prime.

It is a super-2 number, since 2×22660381² = 1026985734130322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22660301) 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, 11330190 + 11330191.

It is an arithmetic number, because the mean of its divisors is an integer number (11330191).

Almost surely, 2^22660381 is an apocalyptic number.

It is an amenable number.

22660381 is a deficient number, since it is larger than the sum of its proper divisors (1).

22660381 is an equidigital number, since it uses as much as digits as its factorization.

22660381 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 22660381 is about 4760.2921128855. The cubic root of 22660381 is about 282.9799958391.

The spelling of 22660381 in words is "twenty-two million, six hundred sixty thousand, three hundred eighty-one".