18320461 has 2 divisors, whose sum is σ = 18320462. Its totient is φ = 18320460.

The previous prime is 18320429. The next prime is 18320521. The reversal of 18320461 is 16402381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18224361 + 96100 = 4269^2 + 310^2 .

It is a cyclic number.

It is not a de Polignac number, because 18320461 - 2⁵ = 18320429 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18320261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9160230 + 9160231.

It is an arithmetic number, because the mean of its divisors is an integer number (9160231).

Almost surely, 2^18320461 is an apocalyptic number.

It is an amenable number.

18320461 is a deficient number, since it is larger than the sum of its proper divisors (1).

18320461 is an equidigital number, since it uses as much as digits as its factorization.

18320461 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 18320461 is about 4280.2407642561. The cubic root of 18320461 is about 263.6202692261.

It can be divided in two parts, 18320 and 461, that added together give a palindrome (18781).

The spelling of 18320461 in words is "eighteen million, three hundred twenty thousand, four hundred sixty-one".