18112621 has 2 divisors, whose sum is σ = 18112622. Its totient is φ = 18112620.

The previous prime is 18112609. The next prime is 18112637. The reversal of 18112621 is 12621181.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16933225 + 1179396 = 4115^2 + 1086^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18112621 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 18112592 and 18112601.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18112121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9056310 + 9056311.

It is an arithmetic number, because the mean of its divisors is an integer number (9056311).

Almost surely, 2^18112621 is an apocalyptic number.

It is an amenable number.

18112621 is a deficient number, since it is larger than the sum of its proper divisors (1).

18112621 is an equidigital number, since it uses as much as digits as its factorization.

18112621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 192, while the sum is 22.

The square root of 18112621 is about 4255.8925033417. The cubic root of 18112621 is about 262.6195784747.

The spelling of 18112621 in words is "eighteen million, one hundred twelve thousand, six hundred twenty-one".