5187111857 has 2 divisors, whose sum is σ = 5187111858. Its totient is φ = 5187111856.

The previous prime is 5187111847. The next prime is 5187111863. The reversal of 5187111857 is 7581117815.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2934280561 + 2252831296 = 54169^2 + 47464^2 .

It is a cyclic number.

It is not a de Polignac number, because 5187111857 - 2³⁰ = 4113370033 is a prime.

It is a super-2 number, since 2×5187111857² = 53812258834059976898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (5187111847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2593555928 + 2593555929.

It is an arithmetic number, because the mean of its divisors is an integer number (2593555929).

Almost surely, 2^5187111857 is an apocalyptic number.

It is an amenable number.

5187111857 is a deficient number, since it is larger than the sum of its proper divisors (1).

5187111857 is an equidigital number, since it uses as much as digits as its factorization.

5187111857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 78400, while the sum is 44.

The square root of 5187111857 is about 72021.6068759924. The cubic root of 5187111857 is about 1731.0457171378.

The spelling of 5187111857 in words is "five billion, one hundred eighty-seven million, one hundred eleven thousand, eight hundred fifty-seven".