2861981215 has 4 divisors (see below), whose sum is σ = 3434377464. Its totient is φ = 2289584968.

The previous prime is 2861981201. The next prime is 2861981219. The reversal of 2861981215 is 5121891682.

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

It is a cyclic number.

It is not a de Polignac number, because 2861981215 - 2¹¹ = 2861979167 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 (2861981219) 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, 286198117 + ... + 286198126.

It is an arithmetic number, because the mean of its divisors is an integer number (858594366).

Almost surely, 2^2861981215 is an apocalyptic number.

2861981215 is a deficient number, since it is larger than the sum of its proper divisors (572396249).

2861981215 is an equidigital number, since it uses as much as digits as its factorization.

2861981215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 572396248.

The product of its digits is 69120, while the sum is 43.

The square root of 2861981215 is about 53497.4879316777. The cubic root of 2861981215 is about 1419.7839410413.

The spelling of 2861981215 in words is "two billion, eight hundred sixty-one million, nine hundred eighty-one thousand, two hundred fifteen".