5256991 has 4 divisors (see below), whose sum is σ = 5266800. Its totient is φ = 5247184.

The previous prime is 5256989. The next prime is 5257003. The reversal of 5256991 is 1996525.

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 5256991 - 2¹ = 5256989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 5256991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5256931) 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, 4051 + ... + 5188.

It is an arithmetic number, because the mean of its divisors is an integer number (1316700).

Almost surely, 2^5256991 is an apocalyptic number.

5256991 is a deficient number, since it is larger than the sum of its proper divisors (9809).

5256991 is an equidigital number, since it uses as much as digits as its factorization.

5256991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9808.

The product of its digits is 24300, while the sum is 37.

The square root of 5256991 is about 2292.8129012198. The cubic root of 5256991 is about 173.8784437482.

The spelling of 5256991 in words is "five million, two hundred fifty-six thousand, nine hundred ninety-one".