23921861 has 2 divisors, whose sum is σ = 23921862. Its totient is φ = 23921860.

The previous prime is 23921857. The next prime is 23921899. The reversal of 23921861 is 16812932.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16248961 + 7672900 = 4031^2 + 2770^2 .

It is a cyclic number.

It is not a de Polignac number, because 23921861 - 2² = 23921857 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23921831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11960930 + 11960931.

It is an arithmetic number, because the mean of its divisors is an integer number (11960931).

Almost surely, 2^23921861 is an apocalyptic number.

It is an amenable number.

23921861 is a deficient number, since it is larger than the sum of its proper divisors (1).

23921861 is an equidigital number, since it uses as much as digits as its factorization.

23921861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 32.

The square root of 23921861 is about 4890.9979554279. The cubic root of 23921861 is about 288.1365294345.

The spelling of 23921861 in words is "twenty-three million, nine hundred twenty-one thousand, eight hundred sixty-one".