2780749897 has 2 divisors, whose sum is σ = 2780749898. Its totient is φ = 2780749896.

The previous prime is 2780749889. The next prime is 2780749973. The reversal of 2780749897 is 7989470872.

2780749897 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1400181561 + 1380568336 = 37419^2 + 37156^2 .

It is a cyclic number.

It is not a de Polignac number, because 2780749897 - 2³ = 2780749889 is a prime.

It is not a weakly prime, because it can be changed into another prime (2780749297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1390374948 + 1390374949.

It is an arithmetic number, because the mean of its divisors is an integer number (1390374949).

Almost surely, 2^2780749897 is an apocalyptic number.

It is an amenable number.

2780749897 is a deficient number, since it is larger than the sum of its proper divisors (1).

2780749897 is an equidigital number, since it uses as much as digits as its factorization.

2780749897 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14224896, while the sum is 61.

The square root of 2780749897 is about 52732.8161299963. The cubic root of 2780749897 is about 1406.2222866190. Note that the first 4 decimals are identical.

The spelling of 2780749897 in words is "two billion, seven hundred eighty million, seven hundred forty-nine thousand, eight hundred ninety-seven".