18641047 has 2 divisors, whose sum is σ = 18641048. Its totient is φ = 18641046.

The previous prime is 18641039. The next prime is 18641057. The reversal of 18641047 is 74014681.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18641047 - 2³ = 18641039 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18641057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9320523 + 9320524.

It is an arithmetic number, because the mean of its divisors is an integer number (9320524).

Almost surely, 2^18641047 is an apocalyptic number.

18641047 is a deficient number, since it is larger than the sum of its proper divisors (1).

18641047 is an equidigital number, since it uses as much as digits as its factorization.

18641047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 18641047 is about 4317.5278806280. The cubic root of 18641047 is about 265.1490652969.

The spelling of 18641047 in words is "eighteen million, six hundred forty-one thousand, forty-seven".