864539811 has 96 divisors (see below), whose sum is σ = 1457584128. Its totient is φ = 509483520.

The previous prime is 864539771. The next prime is 864539831. The reversal of 864539811 is 118935468.

It is not a de Polignac number, because 864539811 - 2²⁶ = 797430947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (864539831) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 5506545 + ... + 5506701.

It is an arithmetic number, because the mean of its divisors is an integer number (15183168).

Almost surely, 2^864539811 is an apocalyptic number.

864539811 is a gapful number since it is divisible by the number (81) formed by its first and last digit.

864539811 is a deficient number, since it is larger than the sum of its proper divisors (593044317).

864539811 is a wasteful number, since it uses less digits than its factorization.

864539811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263 (or 251 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The square root of 864539811 is about 29403.0578511828. The cubic root of 864539811 is about 952.6389455683.

The spelling of 864539811 in words is "eight hundred sixty-four million, five hundred thirty-nine thousand, eight hundred eleven".