22991625 has 48 divisors (see below), whose sum is σ = 42052608. Its totient is φ = 12084000.

The previous prime is 22991623. The next prime is 22991629. The reversal of 22991625 is 52619922.

It is a happy number.

22991625 is a `hidden beast` number, since 2 + 29 + 9 + 1 + 625 = 666.

It is not a de Polignac number, because 22991625 - 2¹ = 22991623 is a prime.

It is a super-2 number, since 2×22991625² = 1057229640281250, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 22991625.

It is not an unprimeable number, because it can be changed into a prime (22991621) 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 47 ways as a sum of consecutive naturals, for example, 120280 + ... + 120470.

It is an arithmetic number, because the mean of its divisors is an integer number (876096).

Almost surely, 2^22991625 is an apocalyptic number.

22991625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

22991625 is a deficient number, since it is larger than the sum of its proper divisors (19060983).

22991625 is a wasteful number, since it uses less digits than its factorization.

22991625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319 (or 306 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 22991625 is about 4794.9582897039. The cubic root of 22991625 is about 284.3521758440.

The spelling of 22991625 in words is "twenty-two million, nine hundred ninety-one thousand, six hundred twenty-five".