997772771 has 2 divisors, whose sum is σ = 997772772. Its totient is φ = 997772770.

The previous prime is 997772759. The next prime is 997772779. The reversal of 997772771 is 177277799.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 997772771 - 2¹⁴ = 997756387 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (997772779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498886385 + 498886386.

It is an arithmetic number, because the mean of its divisors is an integer number (498886386).

Almost surely, 2^997772771 is an apocalyptic number.

997772771 is a deficient number, since it is larger than the sum of its proper divisors (1).

997772771 is an equidigital number, since it uses as much as digits as its factorization.

997772771 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2722734, while the sum is 56.

The square root of 997772771 is about 31587.5413889717. The cubic root of 997772771 is about 999.2570384782.

The spelling of 997772771 in words is "nine hundred ninety-seven million, seven hundred seventy-two thousand, seven hundred seventy-one".