23522257 has 4 divisors (see below), whose sum is σ = 25660656. Its totient is φ = 21383860.

The previous prime is 23522249. The next prime is 23522287. The reversal of 23522257 is 75222532.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 23522257 - 2³ = 23522249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23522227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1069183 + ... + 1069204.

It is an arithmetic number, because the mean of its divisors is an integer number (6415164).

Almost surely, 2^23522257 is an apocalyptic number.

It is an amenable number.

23522257 is a deficient number, since it is larger than the sum of its proper divisors (2138399).

23522257 is a wasteful number, since it uses less digits than its factorization.

23522257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2138398.

The product of its digits is 8400, while the sum is 28.

The square root of 23522257 is about 4849.9749483889. The cubic root of 23522257 is about 286.5231146838.

Adding to 23522257 its reverse (75222532), we get a palindrome (98744789).

The spelling of 23522257 in words is "twenty-three million, five hundred twenty-two thousand, two hundred fifty-seven".