5208906991 has 4 divisors (see below), whose sum is σ = 5435381232. Its totient is φ = 4982432752.

The previous prime is 5208906979. The next prime is 5208907001. The reversal of 5208906991 is 1996098025.

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 5208906991 - 2²⁹ = 4672036079 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5208906931) 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, 113237086 + ... + 113237131.

It is an arithmetic number, because the mean of its divisors is an integer number (1358845308).

Almost surely, 2^5208906991 is an apocalyptic number.

5208906991 is a deficient number, since it is larger than the sum of its proper divisors (226474241).

5208906991 is a wasteful number, since it uses less digits than its factorization.

5208906991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 226474240.

The product of its (nonzero) digits is 349920, while the sum is 49.

The square root of 5208906991 is about 72172.7579561707. The cubic root of 5208906991 is about 1733.4668238620.

The spelling of 5208906991 in words is "five billion, two hundred eight million, nine hundred six thousand, nine hundred ninety-one".