989256971 has 2 divisors, whose sum is σ = 989256972. Its totient is φ = 989256970.

The previous prime is 989256967. The next prime is 989256977. The reversal of 989256971 is 179652989.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 989256971 - 2² = 989256967 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (989256977) 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, 494628485 + 494628486.

It is an arithmetic number, because the mean of its divisors is an integer number (494628486).

Almost surely, 2^989256971 is an apocalyptic number.

989256971 is a deficient number, since it is larger than the sum of its proper divisors (1).

989256971 is an equidigital number, since it uses as much as digits as its factorization.

989256971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2449440, while the sum is 56.

The square root of 989256971 is about 31452.4557228843. The cubic root of 989256971 is about 996.4060896147.

The spelling of 989256971 in words is "nine hundred eighty-nine million, two hundred fifty-six thousand, nine hundred seventy-one".