5256137309 has 4 divisors (see below), whose sum is σ = 5270778720. Its totient is φ = 5241495900.

The previous prime is 5256137297. The next prime is 5256137317. The reversal of 5256137309 is 9037316525.

It is a happy number.

5256137309 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 5256137309 - 2¹⁶ = 5256071773 is a prime.

It is a super-2 number, since 2×5256137309² = 55253958822123522962, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5256137329) 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, 7320167 + ... + 7320884.

It is an arithmetic number, because the mean of its divisors is an integer number (1317694680).

Almost surely, 2^5256137309 is an apocalyptic number.

It is an amenable number.

5256137309 is a deficient number, since it is larger than the sum of its proper divisors (14641411).

5256137309 is a wasteful number, since it uses less digits than its factorization.

5256137309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14641410.

The product of its (nonzero) digits is 170100, while the sum is 41.

The square root of 5256137309 is about 72499.2228165240. Note that the first 3 decimals coincide. The cubic root of 5256137309 is about 1738.6903110779.

The spelling of 5256137309 in words is "five billion, two hundred fifty-six million, one hundred thirty-seven thousand, three hundred nine".