8109911257 has 12 divisors (see below), whose sum is σ = 9593879760. Its totient is φ = 6833530536.

The previous prime is 8109911239. The next prime is 8109911273. The reversal of 8109911257 is 7521199018.

It is not a de Polignac number, because 8109911257 - 2¹⁹ = 8109386969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8109911207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1399723 + ... + 1405504.

It is an arithmetic number, because the mean of its divisors is an integer number (799489980).

Almost surely, 2^8109911257 is an apocalyptic number.

It is an amenable number.

8109911257 is a deficient number, since it is larger than the sum of its proper divisors (1483968503).

8109911257 is a wasteful number, since it uses less digits than its factorization.

8109911257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2805300 (or 2805293 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 43.

The square root of 8109911257 is about 90055.0457053907. The cubic root of 8109911257 is about 2009.1176425503.

The spelling of 8109911257 in words is "eight billion, one hundred nine million, nine hundred eleven thousand, two hundred fifty-seven".