22961681 has 8 divisors (see below), whose sum is σ = 23909928. Its totient is φ = 22032000.

The previous prime is 22961677. The next prime is 22961689. The reversal of 22961681 is 18616922.

It can be written as a sum of positive squares in 4 ways, for example, as 313600 + 22648081 = 560^2 + 4759^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 22961681 - 2² = 22961677 is a prime.

It is a super-2 number, since 2×22961681² = 1054477588691522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (22961689) 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 in 7 ways as a sum of consecutive naturals, for example, 2090 + ... + 7091.

It is an arithmetic number, because the mean of its divisors is an integer number (2988741).

Almost surely, 2^22961681 is an apocalyptic number.

It is an amenable number.

22961681 is a deficient number, since it is larger than the sum of its proper divisors (948247).

22961681 is an equidigital number, since it uses as much as digits as its factorization.

22961681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9283.

The product of its digits is 10368, while the sum is 35.

The square root of 22961681 is about 4791.8348260348. The cubic root of 22961681 is about 284.2286766613.

The spelling of 22961681 in words is "twenty-two million, nine hundred sixty-one thousand, six hundred eighty-one".