2891007997 has 2 divisors, whose sum is σ = 2891007998. Its totient is φ = 2891007996.

The previous prime is 2891007979. The next prime is 2891008019. The reversal of 2891007997 is 7997001982.

Together with previous prime (2891007979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1469265561 + 1421742436 = 38331^2 + 37706^2 .

It is a cyclic number.

It is not a de Polignac number, because 2891007997 - 2⁷ = 2891007869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2891007967) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1445503998 + 1445503999.

It is an arithmetic number, because the mean of its divisors is an integer number (1445503999).

Almost surely, 2^2891007997 is an apocalyptic number.

It is an amenable number.

2891007997 is a deficient number, since it is larger than the sum of its proper divisors (1).

2891007997 is an equidigital number, since it uses as much as digits as its factorization.

2891007997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 571536, while the sum is 52.

The square root of 2891007997 is about 53768.0946007946. The cubic root of 2891007997 is about 1424.5677149006.

The spelling of 2891007997 in words is "two billion, eight hundred ninety-one million, seven thousand, nine hundred ninety-seven".