23641531 has 4 divisors (see below), whose sum is σ = 23792272. Its totient is φ = 23490792.

The previous prime is 23641511. The next prime is 23641547. The reversal of 23641531 is 13514632.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 23641531 - 2⁷ = 23641403 is a prime.

It is a super-2 number, since 2×23641531² = 1117843976047922, 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 = 23641496 and 23641505.

It is not an unprimeable number, because it can be changed into a prime (23641511) 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, 75135 + ... + 75448.

It is an arithmetic number, because the mean of its divisors is an integer number (5948068).

Almost surely, 2^23641531 is an apocalyptic number.

23641531 is a deficient number, since it is larger than the sum of its proper divisors (150741).

23641531 is a wasteful number, since it uses less digits than its factorization.

23641531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 150740.

The product of its digits is 2160, while the sum is 25.

The square root of 23641531 is about 4862.2557522204. The cubic root of 23641531 is about 287.0065880879.

The spelling of 23641531 in words is "twenty-three million, six hundred forty-one thousand, five hundred thirty-one".