2218531 has 8 divisors (see below), whose sum is σ = 2544480. Its totient is φ = 1894848.

The previous prime is 2218523. The next prime is 2218547. The reversal of 2218531 is 1358122.

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 2218531 - 2³ = 2218523 is a prime.

It is a super-2 number, since 2×2218531² = 9843759595922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2218561) 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, 3615 + ... + 4183.

It is an arithmetic number, because the mean of its divisors is an integer number (318060).

2^2218531 is an apocalyptic number.

2218531 is a deficient number, since it is larger than the sum of its proper divisors (325949).

2218531 is an equidigital number, since it uses as much as digits as its factorization.

2218531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1133.

The product of its digits is 480, while the sum is 22.

The square root of 2218531 is about 1489.4733968756. The cubic root of 2218531 is about 130.4232947644.

The spelling of 2218531 in words is "two million, two hundred eighteen thousand, five hundred thirty-one".