6521693049 has 27 divisors (see below), whose sum is σ = 9791863887. Its totient is φ = 4343434488.

The previous prime is 6521693041. The next prime is 6521693099. The reversal of 6521693049 is 9403961256.

The square root of 6521693049 is 80757.

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., 5613755625 + 907937424 = 74925^2 + 30132^2 .

It is a tau number, because it is divible by the number of its divisors (27).

It is not a de Polignac number, because 6521693049 - 2³ = 6521693041 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 6521692995 and 6521693013.

It is not an unprimeable number, because it can be changed into a prime (6521693041) 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, 6540819 + ... + 6541815.

Almost surely, 2^6521693049 is an apocalyptic number.

6521693049 is the 80757-th square number.

6521693049 is the 40379-th centered octagonal number.

It is an amenable number.

6521693049 is a deficient number, since it is larger than the sum of its proper divisors (3270170838).

6521693049 is an frugal number, since it uses more digits than its factorization.

6521693049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2018 (or 1000 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 45.

The cubic root of 6521693049 is about 1868.3294152893.

The spelling of 6521693049 in words is "six billion, five hundred twenty-one million, six hundred ninety-three thousand, forty-nine".