5557681 has 4 divisors (see below), whose sum is σ = 5562432. Its totient is φ = 5552932.

The previous prime is 5557663. The next prime is 5557723. The reversal of 5557681 is 1867555.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 5557681 - 2⁷ = 5557553 is a prime.

It is a super-2 number, since 2×5557681² = 61775636195522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 5557681.

It is not an unprimeable number, because it can be changed into a prime (5557631) 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, 756 + ... + 3418.

It is an arithmetic number, because the mean of its divisors is an integer number (1390608).

Almost surely, 2^5557681 is an apocalyptic number.

It is an amenable number.

5557681 is a deficient number, since it is larger than the sum of its proper divisors (4751).

5557681 is a wasteful number, since it uses less digits than its factorization.

5557681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4750.

The product of its digits is 42000, while the sum is 37.

The square root of 5557681 is about 2357.4734356934. The cubic root of 5557681 is about 177.1323448682.

The spelling of 5557681 in words is "five million, five hundred fifty-seven thousand, six hundred eighty-one".