989696971 has 2 divisors, whose sum is σ = 989696972. Its totient is φ = 989696970.

The previous prime is 989696957. The next prime is 989696993. The reversal of 989696971 is 179696989.

It is a weak prime.

It is an emirp because it is prime and its reverse (179696989) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 989696971 - 2⁹ = 989696459 is a prime.

It is not a weakly prime, because it can be changed into another prime (989696921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494848485 + 494848486.

It is an arithmetic number, because the mean of its divisors is an integer number (494848486).

Almost surely, 2^989696971 is an apocalyptic number.

989696971 is a deficient number, since it is larger than the sum of its proper divisors (1).

989696971 is an equidigital number, since it uses as much as digits as its factorization.

989696971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13226976, while the sum is 64.

The square root of 989696971 is about 31459.4496296423. The cubic root of 989696971 is about 996.5537943091.

The spelling of 989696971 in words is "nine hundred eighty-nine million, six hundred ninety-six thousand, nine hundred seventy-one".