2781215947 has 2 divisors, whose sum is σ = 2781215948. Its totient is φ = 2781215946.

The previous prime is 2781215923. The next prime is 2781216001. The reversal of 2781215947 is 7495121872.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2781215947 - 2¹⁵ = 2781183179 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2781215897 and 2781215906.

It is not a weakly prime, because it can be changed into another prime (2781215347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1390607973 + 1390607974.

It is an arithmetic number, because the mean of its divisors is an integer number (1390607974).

Almost surely, 2^2781215947 is an apocalyptic number.

2781215947 is a deficient number, since it is larger than the sum of its proper divisors (1).

2781215947 is an equidigital number, since it uses as much as digits as its factorization.

2781215947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 282240, while the sum is 46.

The square root of 2781215947 is about 52737.2349199311. The cubic root of 2781215947 is about 1406.3008425615.

The spelling of 2781215947 in words is "two billion, seven hundred eighty-one million, two hundred fifteen thousand, nine hundred forty-seven".