18531051 has 16 divisors (see below), whose sum is σ = 30805248. Its totient is φ = 9626400.

The previous prime is 18531041. The next prime is 18531053. The reversal of 18531051 is 15013581.

It is not a de Polignac number, because 18531051 - 2¹⁰ = 18530027 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18531053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39880 + ... + 40341.

It is an arithmetic number, because the mean of its divisors is an integer number (1925328).

Almost surely, 2^18531051 is an apocalyptic number.

18531051 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

18531051 is a deficient number, since it is larger than the sum of its proper divisors (12274197).

18531051 is a wasteful number, since it uses less digits than its factorization.

18531051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80242.

The product of its (nonzero) digits is 600, while the sum is 24.

The square root of 18531051 is about 4304.7707256020. The cubic root of 18531051 is about 264.6265107592.

The spelling of 18531051 in words is "eighteen million, five hundred thirty-one thousand, fifty-one".