23921831 has 2 divisors, whose sum is σ = 23921832. Its totient is φ = 23921830.

The previous prime is 23921827. The next prime is 23921837. The reversal of 23921831 is 13812932.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 23921831 - 2² = 23921827 is a prime.

It is a super-2 number, since 2×23921831² = 1144507996785122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 23921794 and 23921803.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23921837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11960915 + 11960916.

It is an arithmetic number, because the mean of its divisors is an integer number (11960916).

Almost surely, 2^23921831 is an apocalyptic number.

23921831 is a deficient number, since it is larger than the sum of its proper divisors (1).

23921831 is an equidigital number, since it uses as much as digits as its factorization.

23921831 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2592, while the sum is 29.

The square root of 23921831 is about 4890.9948885682. The cubic root of 23921831 is about 288.1364089854.

The spelling of 23921831 in words is "twenty-three million, nine hundred twenty-one thousand, eight hundred thirty-one".