22401525 has 12 divisors (see below), whose sum is σ = 37037312. Its totient is φ = 11947440.

The previous prime is 22401521. The next prime is 22401527. The reversal of 22401525 is 52510422.

It is a happy number.

It is not a de Polignac number, because 22401525 - 2² = 22401521 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22401521) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 149269 + ... + 149418.

Almost surely, 2^22401525 is an apocalyptic number.

22401525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

22401525 is a deficient number, since it is larger than the sum of its proper divisors (14635787).

22401525 is a wasteful number, since it uses less digits than its factorization.

22401525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298700 (or 298695 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 22401525 is about 4733.0249312675. The cubic root of 22401525 is about 281.8983462390.

Adding to 22401525 its reverse (52510422), we get a palindrome (74911947).

The spelling of 22401525 in words is "twenty-two million, four hundred one thousand, five hundred twenty-five".