2778115243 has 4 divisors (see below), whose sum is σ = 2793464128. Its totient is φ = 2762766360.

The previous prime is 2778115201. The next prime is 2778115247. The reversal of 2778115243 is 3425118772.

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 2778115243 - 2¹⁷ = 2777984171 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2778115196 and 2778115205.

It is not an unprimeable number, because it can be changed into a prime (2778115247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7674171 + ... + 7674532.

It is an arithmetic number, because the mean of its divisors is an integer number (698366032).

Almost surely, 2^2778115243 is an apocalyptic number.

2778115243 is a deficient number, since it is larger than the sum of its proper divisors (15348885).

2778115243 is a wasteful number, since it uses less digits than its factorization.

2778115243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15348884.

The product of its digits is 94080, while the sum is 40.

The square root of 2778115243 is about 52707.8290484440. The cubic root of 2778115243 is about 1405.7780323695.

The spelling of 2778115243 in words is "two billion, seven hundred seventy-eight million, one hundred fifteen thousand, two hundred forty-three".