18687901 has 2 divisors, whose sum is σ = 18687902. Its totient is φ = 18687900.

The previous prime is 18687883. The next prime is 18687917. The reversal of 18687901 is 10978681.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17422276 + 1265625 = 4174^2 + 1125^2 .

It is a cyclic number.

It is not a de Polignac number, because 18687901 - 2⁵ = 18687869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18687931) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9343950 + 9343951.

It is an arithmetic number, because the mean of its divisors is an integer number (9343951).

Almost surely, 2^18687901 is an apocalyptic number.

It is an amenable number.

18687901 is a deficient number, since it is larger than the sum of its proper divisors (1).

18687901 is an equidigital number, since it uses as much as digits as its factorization.

18687901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 40.

The square root of 18687901 is about 4322.9504970564. The cubic root of 18687901 is about 265.3710288705.

The spelling of 18687901 in words is "eighteen million, six hundred eighty-seven thousand, nine hundred one".