2118257 has 4 divisors (see below), whose sum is σ = 2127360. Its totient is φ = 2109156.

The previous prime is 2118239. The next prime is 2118269. The reversal of 2118257 is 7528112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2118257 - 2¹⁰ = 2117233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2108257) 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, 4193 + ... + 4670.

It is an arithmetic number, because the mean of its divisors is an integer number (531840).

2^2118257 is an apocalyptic number.

It is an amenable number.

2118257 is a deficient number, since it is larger than the sum of its proper divisors (9103).

2118257 is an equidigital number, since it uses as much as digits as its factorization.

2118257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9102.

The product of its digits is 1120, while the sum is 26.

The square root of 2118257 is about 1455.4233061209. The cubic root of 2118257 is about 128.4279499394.

The spelling of 2118257 in words is "two million, one hundred eighteen thousand, two hundred fifty-seven".