18414661 has 2 divisors, whose sum is σ = 18414662. Its totient is φ = 18414660.

The previous prime is 18414659. The next prime is 18414673. The reversal of 18414661 is 16641481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17724100 + 690561 = 4210^2 + 831^2 .

It is a cyclic number.

It is not a de Polignac number, because 18414661 - 2¹ = 18414659 is a prime.

Together with 18414659, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18414611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9207330 + 9207331.

It is an arithmetic number, because the mean of its divisors is an integer number (9207331).

Almost surely, 2^18414661 is an apocalyptic number.

It is an amenable number.

18414661 is a deficient number, since it is larger than the sum of its proper divisors (1).

18414661 is an equidigital number, since it uses as much as digits as its factorization.

18414661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4608, while the sum is 31.

The square root of 18414661 is about 4291.2307092488. The cubic root of 18414661 is about 264.0713238955.

The spelling of 18414661 in words is "eighteen million, four hundred fourteen thousand, six hundred sixty-one".