22897521 has 24 divisors (see below), whose sum is σ = 35366760. Its totient is φ = 14224896.

The previous prime is 22897519. The next prime is 22897531. The reversal of 22897521 is 12579822.

It can be written as a sum of positive squares in 4 ways, for example, as 15800625 + 7096896 = 3975^2 + 2664^2 .

It is not a de Polignac number, because 22897521 - 2¹ = 22897519 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22897531) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15991 + ... + 17363.

It is an arithmetic number, because the mean of its divisors is an integer number (1473615).

Almost surely, 2^22897521 is an apocalyptic number.

It is an amenable number.

22897521 is a deficient number, since it is larger than the sum of its proper divisors (12469239).

22897521 is a wasteful number, since it uses less digits than its factorization.

22897521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1505 (or 1502 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 22897521 is about 4785.1354212812. The cubic root of 22897521 is about 283.9636971715.

The spelling of 22897521 in words is "twenty-two million, eight hundred ninety-seven thousand, five hundred twenty-one".