18793961 has 2 divisors, whose sum is σ = 18793962. Its totient is φ = 18793960.

The previous prime is 18793933. The next prime is 18793963. The reversal of 18793961 is 16939781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12033961 + 6760000 = 3469^2 + 2600^2 .

It is a cyclic number.

It is not a de Polignac number, because 18793961 - 2⁶ = 18793897 is a prime.

Together with 18793963, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (18793963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9396980 + 9396981.

It is an arithmetic number, because the mean of its divisors is an integer number (9396981).

Almost surely, 2^18793961 is an apocalyptic number.

It is an amenable number.

18793961 is a deficient number, since it is larger than the sum of its proper divisors (1).

18793961 is an equidigital number, since it uses as much as digits as its factorization.

18793961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 44.

The square root of 18793961 is about 4335.2002260565. The cubic root of 18793961 is about 265.8721048348.

The spelling of 18793961 in words is "eighteen million, seven hundred ninety-three thousand, nine hundred sixty-one".