8201989 has 2 divisors, whose sum is σ = 8201990. Its totient is φ = 8201988.

The previous prime is 8201987. The next prime is 8202013. The reversal of 8201989 is 9891028.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6076225 + 2125764 = 2465^2 + 1458^2 .

It is a cyclic number.

It is not a de Polignac number, because 8201989 - 2¹ = 8201987 is a prime.

It is a super-2 number, since 2×8201989² = 134545247112242, which contains 22 as substring.

Together with 8201987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (8201981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4100994 + 4100995.

It is an arithmetic number, because the mean of its divisors is an integer number (4100995).

Almost surely, 2^8201989 is an apocalyptic number.

It is an amenable number.

8201989 is a deficient number, since it is larger than the sum of its proper divisors (1).

8201989 is an equidigital number, since it uses as much as digits as its factorization.

8201989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 37.

The square root of 8201989 is about 2863.9114860624. The cubic root of 8201989 is about 201.6692705839.

It can be divided in two parts, 820 and 1989, that added together give a square (2809 = 53²).

The spelling of 8201989 in words is "eight million, two hundred one thousand, nine hundred eighty-nine".