2821539449 has 2 divisors, whose sum is σ = 2821539450. Its totient is φ = 2821539448.

The previous prime is 2821539373. The next prime is 2821539491. The reversal of 2821539449 is 9449351282.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2299873849 + 521665600 = 47957^2 + 22840^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2821539449 is a prime.

It is a super-2 number, since 2×2821539449² = 15922169724526447202, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2821538449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1410769724 + 1410769725.

It is an arithmetic number, because the mean of its divisors is an integer number (1410769725).

Almost surely, 2^2821539449 is an apocalyptic number.

It is an amenable number.

2821539449 is a deficient number, since it is larger than the sum of its proper divisors (1).

2821539449 is an equidigital number, since it uses as much as digits as its factorization.

2821539449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 622080, while the sum is 47.

The square root of 2821539449 is about 53118.1649626566. The cubic root of 2821539449 is about 1413.0646833416.

The spelling of 2821539449 in words is "two billion, eight hundred twenty-one million, five hundred thirty-nine thousand, four hundred forty-nine".