18461309 has 2 divisors, whose sum is σ = 18461310. Its totient is φ = 18461308.

The previous prime is 18461299. The next prime is 18461327. The reversal of 18461309 is 90316481.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11035684 + 7425625 = 3322^2 + 2725^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18461309 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18461329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9230654 + 9230655.

It is an arithmetic number, because the mean of its divisors is an integer number (9230655).

Almost surely, 2^18461309 is an apocalyptic number.

It is an amenable number.

18461309 is a deficient number, since it is larger than the sum of its proper divisors (1).

18461309 is an equidigital number, since it uses as much as digits as its factorization.

18461309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 18461309 is about 4296.6625420203. The cubic root of 18461309 is about 264.2941176082.

The spelling of 18461309 in words is "eighteen million, four hundred sixty-one thousand, three hundred nine".