989700997 has 2 divisors, whose sum is σ = 989700998. Its totient is φ = 989700996.

The previous prime is 989700979. The next prime is 989701001. The reversal of 989700997 is 799007989.

Together with previous prime (989700979) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 919241761 + 70459236 = 30319^2 + 8394^2 .

It is a cyclic number.

It is not a de Polignac number, because 989700997 - 2¹¹ = 989698949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989700977) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494850498 + 494850499.

It is an arithmetic number, because the mean of its divisors is an integer number (494850499).

Almost surely, 2^989700997 is an apocalyptic number.

It is an amenable number.

989700997 is a deficient number, since it is larger than the sum of its proper divisors (1).

989700997 is an equidigital number, since it uses as much as digits as its factorization.

989700997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2571912, while the sum is 58.

The square root of 989700997 is about 31459.5136167106. The cubic root of 989700997 is about 996.5551456049. Note that the first 3 decimals are identical.

The spelling of 989700997 in words is "nine hundred eighty-nine million, seven hundred thousand, nine hundred ninety-seven".