8273221749 has 12 divisors (see below), whose sum is σ = 12869456236. Its totient is φ = 5091213312.

The previous prime is 8273221729. The next prime is 8273221763. The reversal of 8273221749 is 9471223728.

It can be written as a sum of positive squares in 2 ways, for example, as 5723981649 + 2549240100 = 75657^2 + 50490^2 .

It is not a de Polignac number, because 8273221749 - 2⁹ = 8273221237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8273221709) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35355532 + ... + 35355765.

Almost surely, 2^8273221749 is an apocalyptic number.

It is an amenable number.

8273221749 is a deficient number, since it is larger than the sum of its proper divisors (4596234487).

8273221749 is a wasteful number, since it uses less digits than its factorization.

8273221749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70711316 (or 70711313 counting only the distinct ones).

The product of its digits is 338688, while the sum is 45.

The square root of 8273221749 is about 90957.2523166790. The cubic root of 8273221749 is about 2022.5140860455.

The spelling of 8273221749 in words is "eight billion, two hundred seventy-three million, two hundred twenty-one thousand, seven hundred forty-nine".