11523557 has 4 divisors (see below), whose sum is σ = 12130080. Its totient is φ = 10917036.

The previous prime is 11523553. The next prime is 11523559. The reversal of 11523557 is 75532511.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 75532511 = 5443 ⋅13877.

It is a cyclic number.

It is not a de Polignac number, because 11523557 - 2² = 11523553 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11523553) 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, 303233 + ... + 303270.

It is an arithmetic number, because the mean of its divisors is an integer number (3032520).

Almost surely, 2^11523557 is an apocalyptic number.

It is an amenable number.

11523557 is a deficient number, since it is larger than the sum of its proper divisors (606523).

11523557 is an equidigital number, since it uses as much as digits as its factorization.

11523557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606522.

The product of its digits is 5250, while the sum is 29.

The square root of 11523557 is about 3394.6365048411. The cubic root of 11523557 is about 225.8718894363.

The spelling of 11523557 in words is "eleven million, five hundred twenty-three thousand, five hundred fifty-seven".