2118553 has 4 divisors (see below), whose sum is σ = 2210688. Its totient is φ = 2026420.

The previous prime is 2118547. The next prime is 2118581. The reversal of 2118553 is 3558112.

It is a happy number.

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 2118553 - 2¹⁷ = 1987481 is a prime.

It is a Duffinian number.

2118553 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2118503) 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, 46033 + ... + 46078.

It is an arithmetic number, because the mean of its divisors is an integer number (552672).

2^2118553 is an apocalyptic number.

2118553 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

2118553 is a deficient number, since it is larger than the sum of its proper divisors (92135).

2118553 is an equidigital number, since it uses as much as digits as its factorization.

2118553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 92134.

The product of its digits is 1200, while the sum is 25.

The square root of 2118553 is about 1455.5249911973. The cubic root of 2118553 is about 128.4339317290.

The spelling of 2118553 in words is "two million, one hundred eighteen thousand, five hundred fifty-three".