997870829 has 2 divisors, whose sum is σ = 997870830. Its totient is φ = 997870828.

The previous prime is 997870793. The next prime is 997870837. The reversal of 997870829 is 928078799.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 790453225 + 207417604 = 28115^2 + 14402^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-997870829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (997870859) 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, 498935414 + 498935415.

It is an arithmetic number, because the mean of its divisors is an integer number (498935415).

Almost surely, 2^997870829 is an apocalyptic number.

It is an amenable number.

997870829 is a deficient number, since it is larger than the sum of its proper divisors (1).

997870829 is an equidigital number, since it uses as much as digits as its factorization.

997870829 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4572288, while the sum is 59.

The square root of 997870829 is about 31589.0935134264. The cubic root of 997870829 is about 999.2897720290.

The spelling of 997870829 in words is "nine hundred ninety-seven million, eight hundred seventy thousand, eight hundred twenty-nine".