6891399082 has 4 divisors (see below), whose sum is σ = 10337098626. Its totient is φ = 3445699540.

The previous prime is 6891399059. The next prime is 6891399113. The reversal of 6891399082 is 2809931986.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 2809931986 = 2 ⋅1404965993.

It can be written as a sum of positive squares in only one way, i.e., 3666181401 + 3225217681 = 60549^2 + 56791^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1722849769 + ... + 1722849772.

Almost surely, 2^6891399082 is an apocalyptic number.

6891399082 is a deficient number, since it is larger than the sum of its proper divisors (3445699544).

6891399082 is a wasteful number, since it uses less digits than its factorization.

6891399082 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3445699543.

The product of its (nonzero) digits is 1679616, while the sum is 55.

The square root of 6891399082 is about 83014.4510431768. The cubic root of 6891399082 is about 1902.9869069397.

The spelling of 6891399082 in words is "six billion, eight hundred ninety-one million, three hundred ninety-nine thousand, eighty-two".