6921075249 has 27 divisors (see below), whose sum is σ = 10992918027. Its totient is φ = 4192927200.

The previous prime is 6921075229. The next prime is 6921075251. The reversal of 6921075249 is 9425701296.

The square root of 6921075249 is 83193.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 5489649 + 6915585600 = 2343^2 + 83160^2 .

It is not a de Polignac number, because 6921075249 - 2²⁵ = 6887520817 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6921075209) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 2744109 + ... + 2746629.

Almost surely, 2^6921075249 is an apocalyptic number.

6921075249 is the 83193-rd square number.

6921075249 is the 41597-th centered octagonal number.

It is an amenable number.

6921075249 is a deficient number, since it is larger than the sum of its proper divisors (4071842778).

6921075249 is an equidigital number, since it uses as much as digits as its factorization.

6921075249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5070 (or 2535 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

The cubic root of 6921075249 is about 1905.7145817771.

The spelling of 6921075249 in words is "six billion, nine hundred twenty-one million, seventy-five thousand, two hundred forty-nine".