18561359 has 4 divisors (see below), whose sum is σ = 18604080. Its totient is φ = 18518640.

The previous prime is 18561313. The next prime is 18561379. The reversal of 18561359 is 95316581.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95316581 = 79 ⋅1206539.

It is a cyclic number.

It is not a de Polignac number, because 18561359 - 2¹² = 18557263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18561379) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20702 + ... + 21579.

It is an arithmetic number, because the mean of its divisors is an integer number (4651020).

Almost surely, 2^18561359 is an apocalyptic number.

18561359 is a deficient number, since it is larger than the sum of its proper divisors (42721).

18561359 is an equidigital number, since it uses as much as digits as its factorization.

18561359 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42720.

The product of its digits is 32400, while the sum is 38.

The square root of 18561359 is about 4308.2895677983. The cubic root of 18561359 is about 264.7706999508.

The spelling of 18561359 in words is "eighteen million, five hundred sixty-one thousand, three hundred fifty-nine".