11523531 has 8 divisors (see below), whose sum is σ = 15594304. Its totient is φ = 7567560.

The previous prime is 11523497. The next prime is 11523553. The reversal of 11523531 is 13532511.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 11523531 - 2⁷ = 11523403 is a prime.

It is a super-2 number, since 2×11523531² = 265583533415922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 11523498 and 11523507.

It is not an unprimeable number, because it can be changed into a prime (11523581) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28465 + ... + 28866.

It is an arithmetic number, because the mean of its divisors is an integer number (1949288).

Almost surely, 2^11523531 is an apocalyptic number.

11523531 is a deficient number, since it is larger than the sum of its proper divisors (4070773).

11523531 is an equidigital number, since it uses as much as digits as its factorization.

11523531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57401.

The product of its digits is 450, while the sum is 21.

The square root of 11523531 is about 3394.6326752684. The cubic root of 11523531 is about 225.8717195619.

The spelling of 11523531 in words is "eleven million, five hundred twenty-three thousand, five hundred thirty-one".