23918861 has 2 divisors, whose sum is σ = 23918862. Its totient is φ = 23918860.

The previous prime is 23918837. The next prime is 23918863. The reversal of 23918861 is 16881932.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22857961 + 1060900 = 4781^2 + 1030^2 .

It is a cyclic number.

It is not a de Polignac number, because 23918861 - 2²² = 19724557 is a prime.

It is a super-2 number, since 2×23918861² = 1144223823074642, which contains 22 as substring.

Together with 23918863, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23918863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11959430 + 11959431.

It is an arithmetic number, because the mean of its divisors is an integer number (11959431).

Almost surely, 2^23918861 is an apocalyptic number.

It is an amenable number.

23918861 is a deficient number, since it is larger than the sum of its proper divisors (1).

23918861 is an equidigital number, since it uses as much as digits as its factorization.

23918861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 38.

The square root of 23918861 is about 4890.6912599345. The cubic root of 23918861 is about 288.1244840265.

The spelling of 23918861 in words is "twenty-three million, nine hundred eighteen thousand, eight hundred sixty-one".