11899661 has 2 divisors, whose sum is σ = 11899662. Its totient is φ = 11899660.

The previous prime is 11899637. The next prime is 11899673. The reversal of 11899661 is 16699811.

It is a happy number.

11899661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9030025 + 2869636 = 3005^2 + 1694^2 .

It is a cyclic number.

It is not a de Polignac number, because 11899661 - 2⁶ = 11899597 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 (11899621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5949830 + 5949831.

It is an arithmetic number, because the mean of its divisors is an integer number (5949831).

Almost surely, 2^11899661 is an apocalyptic number.

It is an amenable number.

11899661 is a deficient number, since it is larger than the sum of its proper divisors (1).

11899661 is an equidigital number, since it uses as much as digits as its factorization.

11899661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23328, while the sum is 41.

The square root of 11899661 is about 3449.5885261869. The cubic root of 11899661 is about 228.3029534353.

The spelling of 11899661 in words is "eleven million, eight hundred ninety-nine thousand, six hundred sixty-one".