18123901 has 2 divisors, whose sum is σ = 18123902. Its totient is φ = 18123900.

The previous prime is 18123881. The next prime is 18123947. The reversal of 18123901 is 10932181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18071001 + 52900 = 4251^2 + 230^2 .

It is a cyclic number.

It is not a de Polignac number, because 18123901 - 2⁷ = 18123773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18123991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9061950 + 9061951.

It is an arithmetic number, because the mean of its divisors is an integer number (9061951).

Almost surely, 2^18123901 is an apocalyptic number.

It is an amenable number.

18123901 is a deficient number, since it is larger than the sum of its proper divisors (1).

18123901 is an equidigital number, since it uses as much as digits as its factorization.

18123901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 18123901 is about 4257.2175185208. The cubic root of 18123901 is about 262.6740843743.

The spelling of 18123901 in words is "eighteen million, one hundred twenty-three thousand, nine hundred one".