2811987361 has 4 divisors (see below), whose sum is σ = 2814146752. Its totient is φ = 2809827972.

The previous prime is 2811987329. The next prime is 2811987371. The reversal of 2811987361 is 1637891182.

It is a happy number.

2811987361 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, and also an emirpimes, since its reverse is a distinct semiprime: 1637891182 = 2 ⋅818945591.

It is a cyclic number.

It is not a de Polignac number, because 2811987361 - 2⁵ = 2811987329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2811987371) 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, 1077741 + ... + 1080346.

It is an arithmetic number, because the mean of its divisors is an integer number (703536688).

Almost surely, 2^2811987361 is an apocalyptic number.

It is an amenable number.

2811987361 is a deficient number, since it is larger than the sum of its proper divisors (2159391).

2811987361 is a wasteful number, since it uses less digits than its factorization.

2811987361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2159390.

The product of its digits is 145152, while the sum is 46.

The square root of 2811987361 is about 53028.1751618892. The cubic root of 2811987361 is about 1411.4682760181.

The spelling of 2811987361 in words is "two billion, eight hundred eleven million, nine hundred eighty-seven thousand, three hundred sixty-one".