5663891 has 4 divisors (see below), whose sum is σ = 5672352. Its totient is φ = 5655432.

The previous prime is 5663887. The next prime is 5663893. The reversal of 5663891 is 1983665.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1983665 = 5 ⋅396733.

It is a cyclic number.

It is not a de Polignac number, because 5663891 - 2² = 5663887 is a prime.

It is a super-2 number, since 2×5663891² = 64159322519762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5663893) 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, 3131 + ... + 4596.

It is an arithmetic number, because the mean of its divisors is an integer number (1418088).

Almost surely, 2^5663891 is an apocalyptic number.

5663891 is a deficient number, since it is larger than the sum of its proper divisors (8461).

5663891 is an equidigital number, since it uses as much as digits as its factorization.

5663891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8460.

The product of its digits is 38880, while the sum is 38.

The square root of 5663891 is about 2379.8930648246. The cubic root of 5663891 is about 178.2535942655.

The spelling of 5663891 in words is "five million, six hundred sixty-three thousand, eight hundred ninety-one".