2780749297 has 2 divisors, whose sum is σ = 2780749298. Its totient is φ = 2780749296.

The previous prime is 2780749291. The next prime is 2780749333. The reversal of 2780749297 is 7929470872.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2779503841 + 1245456 = 52721^2 + 1116^2 .

It is a cyclic number.

It is not a de Polignac number, because 2780749297 - 2¹⁵ = 2780716529 is a prime.

It is not a weakly prime, because it can be changed into another prime (2780749291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1390374648 + 1390374649.

It is an arithmetic number, because the mean of its divisors is an integer number (1390374649).

Almost surely, 2^2780749297 is an apocalyptic number.

It is an amenable number.

2780749297 is a deficient number, since it is larger than the sum of its proper divisors (1).

2780749297 is an equidigital number, since it uses as much as digits as its factorization.

2780749297 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3556224, while the sum is 55.

The square root of 2780749297 is about 52732.8104409390. The cubic root of 2780749297 is about 1406.2221854792. Note that the first 3 decimals are identical.

The spelling of 2780749297 in words is "two billion, seven hundred eighty million, seven hundred forty-nine thousand, two hundred ninety-seven".