23001556 has 6 divisors (see below), whose sum is σ = 40252730. Its totient is φ = 11500776.

The previous prime is 23001551. The next prime is 23001613. The reversal of 23001556 is 65510032.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 21715600 + 1285956 = 4660^2 + 1134^2 .

It is a super-2 number, since 2×23001556² = 1058143156842272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23001551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2875191 + ... + 2875198.

Almost surely, 2^23001556 is an apocalyptic number.

It is an amenable number.

23001556 is a deficient number, since it is larger than the sum of its proper divisors (17251174).

23001556 is a wasteful number, since it uses less digits than its factorization.

23001556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5750393 (or 5750391 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 22.

The square root of 23001556 is about 4795.9937447832. The cubic root of 23001556 is about 284.3931109667.

Adding to 23001556 its reverse (65510032), we get a palindrome (88511588).

The spelling of 23001556 in words is "twenty-three million, one thousand, five hundred fifty-six".