6899215249 has 4 divisors (see below), whose sum is σ = 7085680564. Its totient is φ = 6712749936.

The previous prime is 6899215243. The next prime is 6899215283. The reversal of 6899215249 is 9425129986.

6899215249 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9425129986 = 2 ⋅4712564993.

It can be written as a sum of positive squares in 2 ways, for example, as 4212659025 + 2686556224 = 64905^2 + 51832^2 .

It is a cyclic number.

It is not a de Polignac number, because 6899215249 - 2⁷ = 6899215121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6899215249.

It is not an unprimeable number, because it can be changed into a prime (6899215243) 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, 93232602 + ... + 93232675.

It is an arithmetic number, because the mean of its divisors is an integer number (1771420141).

Almost surely, 2^6899215249 is an apocalyptic number.

It is an amenable number.

6899215249 is a deficient number, since it is larger than the sum of its proper divisors (186465315).

6899215249 is a wasteful number, since it uses less digits than its factorization.

6899215249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186465314.

The product of its digits is 2799360, while the sum is 55.

The square root of 6899215249 is about 83061.5148489359. The cubic root of 6899215249 is about 1903.7060857055.

The spelling of 6899215249 in words is "six billion, eight hundred ninety-nine million, two hundred fifteen thousand, two hundred forty-nine".