2871802649 has 4 divisors (see below), whose sum is σ = 2872128720. Its totient is φ = 2871476580.

The previous prime is 2871802643. The next prime is 2871802663. The reversal of 2871802649 is 9462081782.

It is a happy number.

2871802649 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2871802649 - 2⁸ = 2871802393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2871802643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 149447 + ... + 167564.

It is an arithmetic number, because the mean of its divisors is an integer number (718032180).

Almost surely, 2^2871802649 is an apocalyptic number.

It is an amenable number.

2871802649 is a deficient number, since it is larger than the sum of its proper divisors (326071).

2871802649 is an equidigital number, since it uses as much as digits as its factorization.

2871802649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326070.

The product of its (nonzero) digits is 387072, while the sum is 47.

The square root of 2871802649 is about 53589.2027277884. The cubic root of 2871802649 is about 1421.4061731838.

The spelling of 2871802649 in words is "two billion, eight hundred seventy-one million, eight hundred two thousand, six hundred forty-nine".