18115057 has 4 divisors (see below), whose sum is σ = 18294516. Its totient is φ = 17935600.

The previous prime is 18115043. The next prime is 18115061. The reversal of 18115057 is 75051181.

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

It can be written as a sum of positive squares in 2 ways, for example, as 17338896 + 776161 = 4164^2 + 881^2 .

It is a cyclic number.

It is not a de Polignac number, because 18115057 - 2¹¹ = 18113009 is a prime.

It is a super-2 number, since 2×18115057² = 656310580226498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18115157) 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, 89578 + ... + 89779.

It is an arithmetic number, because the mean of its divisors is an integer number (4573629).

Almost surely, 2^18115057 is an apocalyptic number.

It is an amenable number.

18115057 is a deficient number, since it is larger than the sum of its proper divisors (179459).

18115057 is a wasteful number, since it uses less digits than its factorization.

18115057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179458.

The product of its (nonzero) digits is 1400, while the sum is 28.

The square root of 18115057 is about 4256.1786851588. The cubic root of 18115057 is about 262.6313513450.

The spelling of 18115057 in words is "eighteen million, one hundred fifteen thousand, fifty-seven".