2821937581 has 2 divisors, whose sum is σ = 2821937582. Its totient is φ = 2821937580.

The previous prime is 2821937527. The next prime is 2821937617. The reversal of 2821937581 is 1857391282.

It is a happy number.

2821937581 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1925893225 + 896044356 = 43885^2 + 29934^2 .

It is a cyclic number.

It is not a de Polignac number, because 2821937581 - 2¹⁹ = 2821413293 is a prime.

It is a super-2 number, since 2×2821937581² = 15926663422120263122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2821937281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1410968790 + 1410968791.

It is an arithmetic number, because the mean of its divisors is an integer number (1410968791).

Almost surely, 2^2821937581 is an apocalyptic number.

It is an amenable number.

2821937581 is a deficient number, since it is larger than the sum of its proper divisors (1).

2821937581 is an equidigital number, since it uses as much as digits as its factorization.

2821937581 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 46.

The square root of 2821937581 is about 53121.9124373361. The cubic root of 2821937581 is about 1413.1311434921.

The spelling of 2821937581 in words is "two billion, eight hundred twenty-one million, nine hundred thirty-seven thousand, five hundred eighty-one".