5651989 has 4 divisors (see below), whose sum is σ = 6459424. Its totient is φ = 4844556.

The previous prime is 5651983. The next prime is 5651999. The reversal of 5651989 is 9891565.

It is a happy number.

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 an emirpimes, since its reverse is a distinct semiprime: 9891565 = 5 ⋅1978313.

It is a cyclic number.

It is not a de Polignac number, because 5651989 - 2³ = 5651981 is a prime.

It is a super-2 number, since 2×5651989² = 63889959312242, which contains 22 as substring.

It is a d-powerful number, because it can be written as 5⁹ + 6⁸ + 5⁹ + 1 + 9⁴ + 8³ + 9⁵ .

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5651981) 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, 403707 + ... + 403720.

It is an arithmetic number, because the mean of its divisors is an integer number (1614856).

Almost surely, 2^5651989 is an apocalyptic number.

It is an amenable number.

5651989 is a deficient number, since it is larger than the sum of its proper divisors (807435).

5651989 is an equidigital number, since it uses as much as digits as its factorization.

5651989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 807434.

The product of its digits is 97200, while the sum is 43.

The square root of 5651989 is about 2377.3912172800. The cubic root of 5651989 is about 178.1286470578.

The spelling of 5651989 in words is "five million, six hundred fifty-one thousand, nine hundred eighty-nine".