5651639 has 8 divisors (see below), whose sum is σ = 6633888. Its totient is φ = 4713120.

The previous prime is 5651623. The next prime is 5651707. The reversal of 5651639 is 9361565.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 5651639 - 2⁴ = 5651623 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 5651599 and 5651608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5651039) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10652 + ... + 11169.

It is an arithmetic number, because the mean of its divisors is an integer number (829236).

Almost surely, 2^5651639 is an apocalyptic number.

5651639 is a deficient number, since it is larger than the sum of its proper divisors (982249).

5651639 is a wasteful number, since it uses less digits than its factorization.

5651639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21865.

The product of its digits is 24300, while the sum is 35.

The square root of 5651639 is about 2377.3176060426. The cubic root of 5651639 is about 178.1249701036.

The spelling of 5651639 in words is "five million, six hundred fifty-one thousand, six hundred thirty-nine".