13890661 has 2 divisors, whose sum is σ = 13890662. Its totient is φ = 13890660.

The previous prime is 13890637. The next prime is 13890703. The reversal of 13890661 is 16609831.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13645636 + 245025 = 3694^2 + 495^2 .

It is a cyclic number.

It is not a de Polignac number, because 13890661 - 2⁵ = 13890629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13897661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6945330 + 6945331.

It is an arithmetic number, because the mean of its divisors is an integer number (6945331).

Almost surely, 2^13890661 is an apocalyptic number.

It is an amenable number.

13890661 is a deficient number, since it is larger than the sum of its proper divisors (1).

13890661 is an equidigital number, since it uses as much as digits as its factorization.

13890661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 13890661 is about 3727.0177085708. The cubic root of 13890661 is about 240.3851512557.

The spelling of 13890661 in words is "thirteen million, eight hundred ninety thousand, six hundred sixty-one".