23311919 has 2 divisors, whose sum is σ = 23311920. Its totient is φ = 23311918.

The previous prime is 23311909. The next prime is 23311957. The reversal of 23311919 is 91911332.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23311919 is a prime.

It is a super-2 number, since 2×23311919² = 1086891134925122, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 23311891 and 23311900.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23311909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11655959 + 11655960.

It is an arithmetic number, because the mean of its divisors is an integer number (11655960).

Almost surely, 2^23311919 is an apocalyptic number.

23311919 is a deficient number, since it is larger than the sum of its proper divisors (1).

23311919 is an equidigital number, since it uses as much as digits as its factorization.

23311919 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1458, while the sum is 29.

The square root of 23311919 is about 4828.2418125028. The cubic root of 23311919 is about 285.6665184073. Note that the first 3 decimals are identical.

The spelling of 23311919 in words is "twenty-three million, three hundred eleven thousand, nine hundred nineteen".