23553261 has 14 divisors (see below), whose sum is σ = 35314830. Its totient is φ = 15701688.

The previous prime is 23553239. The next prime is 23553269. The reversal of 23553261 is 16235532.

It can be written as a sum of positive squares in only one way, i.e., 23097636 + 455625 = 4806^2 + 675^2 .

It is not a de Polignac number, because 23553261 - 2¹³ = 23545069 is a prime.

It is a super-2 number, since 2×23553261² = 1109512207468242, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23553269) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 15426 + ... + 16883.

Almost surely, 2^23553261 is an apocalyptic number.

It is an amenable number.

23553261 is a deficient number, since it is larger than the sum of its proper divisors (11761569).

23553261 is an frugal number, since it uses more digits than its factorization.

23553261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32327 (or 32312 counting only the distinct ones).

The product of its digits is 5400, while the sum is 27.

The square root of 23553261 is about 4853.1702010129. The cubic root of 23553261 is about 286.6489453320.

Adding to 23553261 its reverse (16235532), we get a palindrome (39788793).

The spelling of 23553261 in words is "twenty-three million, five hundred fifty-three thousand, two hundred sixty-one".