5637981 has 16 divisors (see below), whose sum is σ = 7801920. Its totient is φ = 3619200.

The previous prime is 5637959. The next prime is 5637997. The reversal of 5637981 is 1897365.

It is not a de Polignac number, because 5637981 - 2⁶ = 5637917 is a prime.

It is a super-2 number, since 2×5637981² = 63573659512722, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5637481) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9081 + ... + 9681.

It is an arithmetic number, because the mean of its divisors is an integer number (487620).

Almost surely, 2^5637981 is an apocalyptic number.

It is an amenable number.

5637981 is a deficient number, since it is larger than the sum of its proper divisors (2163939).

5637981 is a wasteful number, since it uses less digits than its factorization.

5637981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 716.

The product of its digits is 45360, while the sum is 39.

The square root of 5637981 is about 2374.4433031766. The cubic root of 5637981 is about 177.9813661426.

The spelling of 5637981 in words is "five million, six hundred thirty-seven thousand, nine hundred eighty-one".