18557121 has 8 divisors (see below), whose sum is σ = 26992224. Its totient is φ = 11246720.

The previous prime is 18557101. The next prime is 18557131. The reversal of 18557121 is 12175581.

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 18557121 - 2¹¹ = 18555073 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18557101) 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, 281136 + ... + 281201.

It is an arithmetic number, because the mean of its divisors is an integer number (3374028).

Almost surely, 2^18557121 is an apocalyptic number.

18557121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

18557121 is a deficient number, since it is larger than the sum of its proper divisors (8435103).

18557121 is a wasteful number, since it uses less digits than its factorization.

18557121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 562351.

The product of its digits is 2800, while the sum is 30.

The square root of 18557121 is about 4307.7976971998. The cubic root of 18557121 is about 264.7505472663.

The spelling of 18557121 in words is "eighteen million, five hundred fifty-seven thousand, one hundred twenty-one".