997829971 has 2 divisors, whose sum is σ = 997829972. Its totient is φ = 997829970.

The previous prime is 997829929. The next prime is 997829981. The reversal of 997829971 is 179928799.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 997829971 - 2¹³ = 997821779 is a prime.

It is not a weakly prime, because it can be changed into another prime (997829981) 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, 498914985 + 498914986.

It is an arithmetic number, because the mean of its divisors is an integer number (498914986).

Almost surely, 2^997829971 is an apocalyptic number.

997829971 is a deficient number, since it is larger than the sum of its proper divisors (1).

997829971 is an equidigital number, since it uses as much as digits as its factorization.

997829971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5143824, while the sum is 61.

The square root of 997829971 is about 31588.4467962576. The cubic root of 997829971 is about 999.2761331432.

The spelling of 997829971 in words is "nine hundred ninety-seven million, eight hundred twenty-nine thousand, nine hundred seventy-one".