2849787781 has 4 divisors (see below), whose sum is σ = 2850809452. Its totient is φ = 2848766112.

The previous prime is 2849787763. The next prime is 2849787799. The reversal of 2849787781 is 1877879482.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (2849787763) and next prime (2849787799).

It can be written as a sum of positive squares in 2 ways, for example, as 2567043556 + 282744225 = 50666^2 + 16815^2 .

It is a cyclic number.

It is not a de Polignac number, because 2849787781 - 2²⁵ = 2816233349 is a prime.

It is a super-2 number, since 2×2849787781² = 16242580793473807922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2849787701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 506640 + ... + 512233.

It is an arithmetic number, because the mean of its divisors is an integer number (712702363).

Almost surely, 2^2849787781 is an apocalyptic number.

It is an amenable number.

2849787781 is a deficient number, since it is larger than the sum of its proper divisors (1021671).

2849787781 is a wasteful number, since it uses less digits than its factorization.

2849787781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1021670.

The product of its digits is 12644352, while the sum is 61.

The square root of 2849787781 is about 53383.4036101109. The cubic root of 2849787781 is about 1417.7647470231.

The spelling of 2849787781 in words is "two billion, eight hundred forty-nine million, seven hundred eighty-seven thousand, seven hundred eighty-one".