18091051 has 4 divisors (see below), whose sum is σ = 19735704. Its totient is φ = 16446400.

The previous prime is 18091049. The next prime is 18091063. The reversal of 18091051 is 15019081.

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 18091051 - 2¹ = 18091049 is a prime.

It is a super-2 number, since 2×18091051² = 654572252569202, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18091081) 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, 822310 + ... + 822331.

It is an arithmetic number, because the mean of its divisors is an integer number (4933926).

Almost surely, 2^18091051 is an apocalyptic number.

18091051 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

18091051 is a deficient number, since it is larger than the sum of its proper divisors (1644653).

18091051 is a wasteful number, since it uses less digits than its factorization.

18091051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1644652.

The product of its (nonzero) digits is 360, while the sum is 25.

The square root of 18091051 is about 4253.3576148732. The cubic root of 18091051 is about 262.5152873939.

The spelling of 18091051 in words is "eighteen million, ninety-one thousand, fifty-one".