12489661 has 2 divisors, whose sum is σ = 12489662. Its totient is φ = 12489660.

The previous prime is 12489649. The next prime is 12489703. The reversal of 12489661 is 16698421.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 9180900 + 3308761 = 3030^2 + 1819^2 .

It is a cyclic number.

It is not a de Polignac number, because 12489661 - 2⁵ = 12489629 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12489661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12489601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6244830 + 6244831.

It is an arithmetic number, because the mean of its divisors is an integer number (6244831).

Almost surely, 2^12489661 is an apocalyptic number.

It is an amenable number.

12489661 is a deficient number, since it is larger than the sum of its proper divisors (1).

12489661 is an equidigital number, since it uses as much as digits as its factorization.

12489661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 37.

The square root of 12489661 is about 3534.0714480610. The cubic root of 12489661 is about 232.0154381819.

It can be divided in two parts, 124896 and 61, that multiplied together give a triangular number (7618656 = T₃₉₀₃).

The spelling of 12489661 in words is "twelve million, four hundred eighty-nine thousand, six hundred sixty-one".