9731989 has 2 divisors, whose sum is σ = 9731990. Its totient is φ = 9731988.

The previous prime is 9731977. The next prime is 9732011. The reversal of 9731989 is 9891379.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9199089 + 532900 = 3033^2 + 730^2 .

It is a cyclic number.

It is not a de Polignac number, because 9731989 - 2¹³ = 9723797 is a prime.

It is a super-2 number, since 2×9731989² = 189423219792242, which contains 22 as substring.

9731989 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (9731929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4865994 + 4865995.

It is an arithmetic number, because the mean of its divisors is an integer number (4865995).

Almost surely, 2^9731989 is an apocalyptic number.

It is an amenable number.

9731989 is a deficient number, since it is larger than the sum of its proper divisors (1).

9731989 is an equidigital number, since it uses as much as digits as its factorization.

9731989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 122472, while the sum is 46.

The square root of 9731989 is about 3119.6135978675. The cubic root of 9731989 is about 213.5013062388.

The spelling of 9731989 in words is "nine million, seven hundred thirty-one thousand, nine hundred eighty-nine".