5209981757 has 4 divisors (see below), whose sum is σ = 5295391356. Its totient is φ = 5124572160.

The previous prime is 5209981753. The next prime is 5209981817. The reversal of 5209981757 is 7571899025.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3010277956 + 2199703801 = 54866^2 + 46901^2 .

It is a cyclic number.

It is not a de Polignac number, because 5209981757 - 2² = 5209981753 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 5209981699 and 5209981708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5209981753) 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, 42704708 + ... + 42704829.

It is an arithmetic number, because the mean of its divisors is an integer number (1323847839).

Almost surely, 2^5209981757 is an apocalyptic number.

It is an amenable number.

5209981757 is a deficient number, since it is larger than the sum of its proper divisors (85409599).

5209981757 is an equidigital number, since it uses as much as digits as its factorization.

5209981757 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85409598.

The product of its (nonzero) digits is 1587600, while the sum is 53.

The square root of 5209981757 is about 72180.2033593699. The cubic root of 5209981757 is about 1733.5860390886.

The spelling of 5209981757 in words is "five billion, two hundred nine million, nine hundred eighty-one thousand, seven hundred fifty-seven".