2779000391 has 2 divisors, whose sum is σ = 2779000392. Its totient is φ = 2779000390.

The previous prime is 2779000331. The next prime is 2779000447. The reversal of 2779000391 is 1930009772.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2779000391 - 2⁶ = 2779000327 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2779000331) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1389500195 + 1389500196.

It is an arithmetic number, because the mean of its divisors is an integer number (1389500196).

Almost surely, 2^2779000391 is an apocalyptic number.

2779000391 is a deficient number, since it is larger than the sum of its proper divisors (1).

2779000391 is an equidigital number, since it uses as much as digits as its factorization.

2779000391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23814, while the sum is 38.

The square root of 2779000391 is about 52716.2251209246. The cubic root of 2779000391 is about 1405.9273169714.

The spelling of 2779000391 in words is "two billion, seven hundred seventy-nine million, three hundred ninety-one", and thus it is an aban number.