989702561 has 2 divisors, whose sum is σ = 989702562. Its totient is φ = 989702560.

The previous prime is 989702503. The next prime is 989702563. The reversal of 989702561 is 165207989.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 931470400 + 58232161 = 30520^2 + 7631^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-989702561 is a prime.

It is a super-2 number, since 2×989702561² = 1959022318499917442, which contains 22 as substring.

Together with 989702563, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (989702563) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494851280 + 494851281.

It is an arithmetic number, because the mean of its divisors is an integer number (494851281).

Almost surely, 2^989702561 is an apocalyptic number.

It is an amenable number.

989702561 is a deficient number, since it is larger than the sum of its proper divisors (1).

989702561 is an equidigital number, since it uses as much as digits as its factorization.

989702561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 272160, while the sum is 47.

The square root of 989702561 is about 31459.5384740463. The cubic root of 989702561 is about 996.5556705485. Note that the first 3 decimals are identical.

The spelling of 989702561 in words is "nine hundred eighty-nine million, seven hundred two thousand, five hundred sixty-one".