18631361 has 8 divisors (see below), whose sum is σ = 21500544. Its totient is φ = 15814080.

The previous prime is 18631351. The next prime is 18631373. The reversal of 18631361 is 16313681.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18631361 - 2¹⁴ = 18614977 is a prime.

It is a super-2 number, since 2×18631361² = 694255225424642, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18631331) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12200 + ... + 13641.

It is an arithmetic number, because the mean of its divisors is an integer number (2687568).

Almost surely, 2^18631361 is an apocalyptic number.

It is an amenable number.

18631361 is a deficient number, since it is larger than the sum of its proper divisors (2869183).

18631361 is a wasteful number, since it uses less digits than its factorization.

18631361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25951.

The product of its digits is 2592, while the sum is 29.

The square root of 18631361 is about 4316.4060281674. The cubic root of 18631361 is about 265.1031329914.

The spelling of 18631361 in words is "eighteen million, six hundred thirty-one thousand, three hundred sixty-one".