18481931 has 8 divisors (see below), whose sum is σ = 20087760. Its totient is φ = 16902432.

The previous prime is 18481919. The next prime is 18481937. The reversal of 18481931 is 13918481.

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 18481931 - 2⁶ = 18481867 is a prime.

It is a super-2 number, since 2×18481931² = 683163546977522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18481891 and 18481900.

It is not an unprimeable number, because it can be changed into a prime (18481937) 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, 5105 + ... + 7938.

It is an arithmetic number, because the mean of its divisors is an integer number (2510970).

Almost surely, 2^18481931 is an apocalyptic number.

18481931 is a deficient number, since it is larger than the sum of its proper divisors (1605829).

18481931 is a wasteful number, since it uses less digits than its factorization.

18481931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13165.

The product of its digits is 6912, while the sum is 35.

The square root of 18481931 is about 4299.0616418005. The cubic root of 18481931 is about 264.3924899241.

The spelling of 18481931 in words is "eighteen million, four hundred eighty-one thousand, nine hundred thirty-one".