2118531 has 8 divisors (see below), whose sum is σ = 2832064. Its totient is φ = 1408680.

The previous prime is 2118527. The next prime is 2118541. The reversal of 2118531 is 1358112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2118531 - 2² = 2118527 is a prime.

It is a super-2 number, since 2×2118531² = 8976347195922, which contains 22 as substring.

It is a Duffinian number.

2118531 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2118498 and 2118507.

It is not an unprimeable number, because it can be changed into a prime (2118541) 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, 996 + ... + 2286.

It is an arithmetic number, because the mean of its divisors is an integer number (354008).

2^2118531 is an apocalyptic number.

2118531 is a deficient number, since it is larger than the sum of its proper divisors (713533).

2118531 is a wasteful number, since it uses less digits than its factorization.

2118531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1841.

The product of its digits is 240, while the sum is 21.

The square root of 2118531 is about 1455.5174337671. The cubic root of 2118531 is about 128.4334871557.

The spelling of 2118531 in words is "two million, one hundred eighteen thousand, five hundred thirty-one".