5649991 has 4 divisors (see below), whose sum is σ = 5656752. Its totient is φ = 5643232.

The previous prime is 5649977. The next prime is 5649997. The reversal of 5649991 is 1999465.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 5649991 - 2²¹ = 3552839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5649997) 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, 1915 + ... + 3868.

It is an arithmetic number, because the mean of its divisors is an integer number (1414188).

Almost surely, 2^5649991 is an apocalyptic number.

5649991 is a deficient number, since it is larger than the sum of its proper divisors (6761).

5649991 is an equidigital number, since it uses as much as digits as its factorization.

5649991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6760.

The product of its digits is 87480, while the sum is 43.

The square root of 5649991 is about 2376.9709716360. The cubic root of 5649991 is about 178.1076548618.

The spelling of 5649991 in words is "five million, six hundred forty-nine thousand, nine hundred ninety-one".