22639081 has 2 divisors, whose sum is σ = 22639082. Its totient is φ = 22639080.

The previous prime is 22639073. The next prime is 22639103. The reversal of 22639081 is 18093622.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22090000 + 549081 = 4700^2 + 741^2 .

It is a cyclic number.

It is not a de Polignac number, because 22639081 - 2³ = 22639073 is a prime.

It is a super-2 number, since 2×22639081² = 1025055977049122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (22639031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11319540 + 11319541.

It is an arithmetic number, because the mean of its divisors is an integer number (11319541).

Almost surely, 2^22639081 is an apocalyptic number.

It is an amenable number.

22639081 is a deficient number, since it is larger than the sum of its proper divisors (1).

22639081 is an equidigital number, since it uses as much as digits as its factorization.

22639081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 22639081 is about 4758.0543292401. The cubic root of 22639081 is about 282.8913041347.

The spelling of 22639081 in words is "twenty-two million, six hundred thirty-nine thousand, eighty-one".