9992817971 has 2 divisors, whose sum is σ = 9992817972. Its totient is φ = 9992817970.

The previous prime is 9992817881. The next prime is 9992817983. The reversal of 9992817971 is 1797182999.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 9992817971 - 2²⁶ = 9925709107 is a prime.

It is a super-2 number, since 2×9992817971² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (9992817371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4996408985 + 4996408986.

It is an arithmetic number, because the mean of its divisors is an integer number (4996408986).

Almost surely, 2^9992817971 is an apocalyptic number.

9992817971 is a deficient number, since it is larger than the sum of its proper divisors (1).

9992817971 is an equidigital number, since it uses as much as digits as its factorization.

9992817971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5143824, while the sum is 62.

The square root of 9992817971 is about 99964.0834049910. The cubic root of 9992817971 is about 2153.9187927584.

The spelling of 9992817971 in words is "nine billion, nine hundred ninety-two million, eight hundred seventeen thousand, nine hundred seventy-one".