2780491297 has 2 divisors, whose sum is σ = 2780491298. Its totient is φ = 2780491296.

The previous prime is 2780491271. The next prime is 2780491409. The reversal of 2780491297 is 7921940872.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2768443456 + 12047841 = 52616^2 + 3471^2 .

It is a cyclic number.

It is not a de Polignac number, because 2780491297 - 2¹¹ = 2780489249 is a prime.

It is a super-2 number, since 2×2780491297² = 15462263705385484418, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2780491297.

It is not a weakly prime, because it can be changed into another prime (2780491267) 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 as a sum of consecutive naturals, namely, 1390245648 + 1390245649.

It is an arithmetic number, because the mean of its divisors is an integer number (1390245649).

Almost surely, 2^2780491297 is an apocalyptic number.

It is an amenable number.

2780491297 is a deficient number, since it is larger than the sum of its proper divisors (1).

2780491297 is an equidigital number, since it uses as much as digits as its factorization.

2780491297 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 508032, while the sum is 49.

The square root of 2780491297 is about 52730.3640893935. The cubic root of 2780491297 is about 1406.1786940186.

The spelling of 2780491297 in words is "two billion, seven hundred eighty million, four hundred ninety-one thousand, two hundred ninety-seven".