12645989 has 2 divisors, whose sum is σ = 12645990. Its totient is φ = 12645988.

The previous prime is 12645979. The next prime is 12646003. The reversal of 12645989 is 98954621.

12645989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11937025 + 708964 = 3455^2 + 842^2 .

It is an emirp because it is prime and its reverse (98954621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12645989 - 2⁴ = 12645973 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12645949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6322994 + 6322995.

It is an arithmetic number, because the mean of its divisors is an integer number (6322995).

Almost surely, 2^12645989 is an apocalyptic number.

It is an amenable number.

12645989 is a deficient number, since it is larger than the sum of its proper divisors (1).

12645989 is an equidigital number, since it uses as much as digits as its factorization.

12645989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 44.

The square root of 12645989 is about 3556.1199361101. The cubic root of 12645989 is about 232.9794415356.

The spelling of 12645989 in words is "twelve million, six hundred forty-five thousand, nine hundred eighty-nine".