5187557257 has 4 divisors (see below), whose sum is σ = 5188151556. Its totient is φ = 5186962960.

The previous prime is 5187557231. The next prime is 5187557261. The reversal of 5187557257 is 7527557815.

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 4567597056 + 619960201 = 67584^2 + 24899^2 .

It is a cyclic number.

It is not a de Polignac number, because 5187557257 - 2⁷ = 5187557129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5187557227) 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, 283858 + ... + 301579.

It is an arithmetic number, because the mean of its divisors is an integer number (1297037889).

Almost surely, 2^5187557257 is an apocalyptic number.

It is an amenable number.

5187557257 is a deficient number, since it is larger than the sum of its proper divisors (594299).

5187557257 is an equidigital number, since it uses as much as digits as its factorization.

5187557257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 594298.

The product of its digits is 3430000, while the sum is 52.

The square root of 5187557257 is about 72024.6989372396. The cubic root of 5187557257 is about 1731.0952620944.

The spelling of 5187557257 in words is "five billion, one hundred eighty-seven million, five hundred fifty-seven thousand, two hundred fifty-seven".