6425989 has 2 divisors, whose sum is σ = 6425990. Its totient is φ = 6425988.

The previous prime is 6425987. The next prime is 6425999. The reversal of 6425989 is 9895246.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5085025 + 1340964 = 2255^2 + 1158^2 .

It is a cyclic number.

It is not a de Polignac number, because 6425989 - 2¹ = 6425987 is a prime.

Together with 6425987, 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 (6425987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3212994 + 3212995.

It is an arithmetic number, because the mean of its divisors is an integer number (3212995).

Almost surely, 2^6425989 is an apocalyptic number.

It is an amenable number.

6425989 is a deficient number, since it is larger than the sum of its proper divisors (1).

6425989 is an equidigital number, since it uses as much as digits as its factorization.

6425989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 155520, while the sum is 43.

The square root of 6425989 is about 2534.9534512492. The cubic root of 6425989 is about 185.9145269595.

The spelling of 6425989 in words is "six million, four hundred twenty-five thousand, nine hundred eighty-nine".