8457727891 has 2 divisors, whose sum is σ = 8457727892. Its totient is φ = 8457727890.

The previous prime is 8457727867. The next prime is 8457728053. The reversal of 8457727891 is 1987277548.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 8457727891 - 2¹⁵ = 8457695123 is a prime.

It is a super-2 number, since 2×8457727891² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (8457721891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4228863945 + 4228863946.

It is an arithmetic number, because the mean of its divisors is an integer number (4228863946).

Almost surely, 2^8457727891 is an apocalyptic number.

8457727891 is a deficient number, since it is larger than the sum of its proper divisors (1).

8457727891 is an equidigital number, since it uses as much as digits as its factorization.

8457727891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7902720, while the sum is 58.

The square root of 8457727891 is about 91965.9061337407. The cubic root of 8457727891 is about 2037.4387865033.

The spelling of 8457727891 in words is "eight billion, four hundred fifty-seven million, seven hundred twenty-seven thousand, eight hundred ninety-one".