5651891 has 16 divisors (see below), whose sum is σ = 6773760. Its totient is φ = 4614720.

The previous prime is 5651887. The next prime is 5651917. The reversal of 5651891 is 1981565.

It is a cyclic number.

It is not a de Polignac number, because 5651891 - 2² = 5651887 is a prime.

It is not an unprimeable number, because it can be changed into a prime (5651801) 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, 13280 + ... + 13698.

It is an arithmetic number, because the mean of its divisors is an integer number (423360).

Almost surely, 2^5651891 is an apocalyptic number.

5651891 is a deficient number, since it is larger than the sum of its proper divisors (1121869).

5651891 is a wasteful number, since it uses less digits than its factorization.

5651891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514.

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

The square root of 5651891 is about 2377.3706063633. The cubic root of 5651891 is about 178.1276175259.

The spelling of 5651891 in words is "five million, six hundred fifty-one thousand, eight hundred ninety-one".