11523657 has 4 divisors (see below), whose sum is σ = 15364880. Its totient is φ = 7682436.

The previous prime is 11523653. The next prime is 11523683. The reversal of 11523657 is 75632511.

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: 75632511 = 3 ⋅25210837.

It is not a de Polignac number, because 11523657 - 2² = 11523653 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11523653) 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, 1920607 + ... + 1920612.

It is an arithmetic number, because the mean of its divisors is an integer number (3841220).

Almost surely, 2^11523657 is an apocalyptic number.

It is an amenable number.

11523657 is a deficient number, since it is larger than the sum of its proper divisors (3841223).

11523657 is an equidigital number, since it uses as much as digits as its factorization.

11523657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3841222.

The product of its digits is 6300, while the sum is 30.

The square root of 11523657 is about 3394.6512339267. The cubic root of 11523657 is about 225.8725427972.

The spelling of 11523657 in words is "eleven million, five hundred twenty-three thousand, six hundred fifty-seven".