989858971 has 2 divisors, whose sum is σ = 989858972. Its totient is φ = 989858970.

The previous prime is 989858959. The next prime is 989858999. The reversal of 989858971 is 179858989.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 989858971 - 2⁵ = 989858939 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (989858921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494929485 + 494929486.

It is an arithmetic number, because the mean of its divisors is an integer number (494929486).

Almost surely, 2^989858971 is an apocalyptic number.

989858971 is a deficient number, since it is larger than the sum of its proper divisors (1).

989858971 is an equidigital number, since it uses as much as digits as its factorization.

989858971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13063680, while the sum is 64.

The square root of 989858971 is about 31462.0242673608. The cubic root of 989858971 is about 996.6081654657.

The spelling of 989858971 in words is "nine hundred eighty-nine million, eight hundred fifty-eight thousand, nine hundred seventy-one".