2891378273 has 4 divisors (see below), whose sum is σ = 3304432320. Its totient is φ = 2478324228.

The previous prime is 2891378221. The next prime is 2891378279. The reversal of 2891378273 is 3728731982.

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.

It is a cyclic number.

It is not a de Polignac number, because 2891378273 - 2²⁰ = 2890329697 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2891378279) 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, 206527013 + ... + 206527026.

It is an arithmetic number, because the mean of its divisors is an integer number (826108080).

Almost surely, 2^2891378273 is an apocalyptic number.

It is an amenable number.

2891378273 is a deficient number, since it is larger than the sum of its proper divisors (413054047).

2891378273 is an equidigital number, since it uses as much as digits as its factorization.

2891378273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 413054046.

The product of its digits is 1016064, while the sum is 50.

The square root of 2891378273 is about 53771.5377593016. The cubic root of 2891378273 is about 1424.6285311415.

The spelling of 2891378273 in words is "two billion, eight hundred ninety-one million, three hundred seventy-eight thousand, two hundred seventy-three".