5516981 has 6 divisors (see below), whose sum is σ = 5605110. Its totient is φ = 5430216.

The previous prime is 5516963. The next prime is 5516983. The reversal of 5516981 is 1896155.

It can be written as a sum of positive squares in only one way, i.e., 5499025 + 17956 = 2345^2 + 134^2 .

It is not a de Polignac number, because 5516981 - 2¹⁴ = 5500597 is a prime.

It is a super-2 number, since 2×5516981² = 60874158708722, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5516983) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3875 + ... + 5103.

It is an arithmetic number, because the mean of its divisors is an integer number (934185).

Almost surely, 2^5516981 is an apocalyptic number.

5516981 is the 1256-th centered heptagonal number.

It is an amenable number.

5516981 is a deficient number, since it is larger than the sum of its proper divisors (88129).

5516981 is an equidigital number, since it uses as much as digits as its factorization.

5516981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1363 (or 1296 counting only the distinct ones).

The product of its digits is 10800, while the sum is 35.

The square root of 5516981 is about 2348.8254511564. The cubic root of 5516981 is about 176.6988932943.

The spelling of 5516981 in words is "five million, five hundred sixteen thousand, nine hundred eighty-one".