18806131 has 4 divisors (see below), whose sum is σ = 19912392. Its totient is φ = 17699872.

The previous prime is 18806107. The next prime is 18806141. The reversal of 18806131 is 13160881.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18806131 - 2¹³ = 18797939 is a prime.

It is a super-2 number, since 2×18806131² = 707341126378322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18806131.

It is not an unprimeable number, because it can be changed into a prime (18806141) 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, 553105 + ... + 553138.

It is an arithmetic number, because the mean of its divisors is an integer number (4978098).

Almost surely, 2^18806131 is an apocalyptic number.

18806131 is a deficient number, since it is larger than the sum of its proper divisors (1106261).

18806131 is a wasteful number, since it uses less digits than its factorization.

18806131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1106260.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 18806131 is about 4336.6036249581. The cubic root of 18806131 is about 265.9294808070.

The spelling of 18806131 in words is "eighteen million, eight hundred six thousand, one hundred thirty-one".