8249849821 has 6 divisors (see below), whose sum is σ = 8293305566. Its totient is φ = 8206620600.

The previous prime is 8249849819. The next prime is 8249849863. The reversal of 8249849821 is 1289489428.

It can be written as a sum of positive squares in only one way, i.e., 7256654596 + 993195225 = 85186^2 + 31515^2 .

It is not a de Polignac number, because 8249849821 - 2¹ = 8249849819 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8249849521) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 76590 + ... + 149551.

Almost surely, 2^8249849821 is an apocalyptic number.

It is an amenable number.

8249849821 is a deficient number, since it is larger than the sum of its proper divisors (43455745).

8249849821 is an equidigital number, since it uses as much as digits as its factorization.

8249849821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226523 (or 226332 counting only the distinct ones).

The product of its digits is 2654208, while the sum is 55.

The square root of 8249849821 is about 90828.6839109761. The cubic root of 8249849821 is about 2020.6077494410.

The spelling of 8249849821 in words is "eight billion, two hundred forty-nine million, eight hundred forty-nine thousand, eight hundred twenty-one".