6811582397 has 4 divisors (see below), whose sum is σ = 6813236220. Its totient is φ = 6809928576.

The previous prime is 6811582369. The next prime is 6811582429. The reversal of 6811582397 is 7932851186.

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 3083136676 + 3728445721 = 55526^2 + 61061^2 .

It is a cyclic number.

It is not a de Polignac number, because 6811582397 - 2⁶ = 6811582333 is a prime.

It is a super-2 number, since 2×6811582397² = 92795309502240531218, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6811582697) 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, 820718 + ... + 828975.

It is an arithmetic number, because the mean of its divisors is an integer number (1703309055).

Almost surely, 2^6811582397 is an apocalyptic number.

It is an amenable number.

6811582397 is a deficient number, since it is larger than the sum of its proper divisors (1653823).

6811582397 is a wasteful number, since it uses less digits than its factorization.

6811582397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1653822.

The product of its digits is 725760, while the sum is 50.

The square root of 6811582397 is about 82532.3112302085. The cubic root of 6811582397 is about 1895.6115148983.

The spelling of 6811582397 in words is "six billion, eight hundred eleven million, five hundred eighty-two thousand, three hundred ninety-seven".