2800961861 has 4 divisors (see below), whose sum is σ = 2853810252. Its totient is φ = 2748113472.

The previous prime is 2800961843. The next prime is 2800961881. The reversal of 2800961861 is 1681690082.

2800961861 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.

It can be written as a sum of positive squares in 2 ways, for example, as 1612022500 + 1188939361 = 40150^2 + 34481^2 .

It is a cyclic number.

It is not a de Polignac number, because 2800961861 - 2¹⁰ = 2800960837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2800961831) 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, 26424116 + ... + 26424221.

It is an arithmetic number, because the mean of its divisors is an integer number (713452563).

Almost surely, 2^2800961861 is an apocalyptic number.

It is an amenable number.

2800961861 is a deficient number, since it is larger than the sum of its proper divisors (52848391).

2800961861 is an equidigital number, since it uses as much as digits as its factorization.

2800961861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52848390.

The product of its (nonzero) digits is 41472, while the sum is 41.

The square root of 2800961861 is about 52924.1141730308. The cubic root of 2800961861 is about 1409.6211213121.

The spelling of 2800961861 in words is "two billion, eight hundred million, nine hundred sixty-one thousand, eight hundred sixty-one".