2851311645 has 128 divisors (see below), whose sum is σ = 6440878080. Its totient is φ = 1164222720.

The previous prime is 2851311641. The next prime is 2851311647. The reversal of 2851311645 is 5461131582.

2851311645 is a `hidden beast` number, since 2 + 8 + 5 + 1 + 3 + 1 + 1 + 645 = 666.

2851311645 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2851311645 - 2² = 2851311641 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2851311641) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 377092 + ... + 384578.

It is an arithmetic number, because the mean of its divisors is an integer number (50319360).

Almost surely, 2^2851311645 is an apocalyptic number.

It is an amenable number.

2851311645 is an abundant number, since it is smaller than the sum of its proper divisors (3589566435).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2851311645 is a wasteful number, since it uses less digits than its factorization.

2851311645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7552 (or 7546 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

The square root of 2851311645 is about 53397.6745280167. The cubic root of 2851311645 is about 1418.0174086068.

The spelling of 2851311645 in words is "two billion, eight hundred fifty-one million, three hundred eleven thousand, six hundred forty-five".