11909869 has 2 divisors, whose sum is σ = 11909870. Its totient is φ = 11909868.

The previous prime is 11909851. The next prime is 11909873. The reversal of 11909869 is 96890911.

11909869 is digitally balanced in base 3, 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., 11594025 + 315844 = 3405^2 + 562^2 .

It is a cyclic number.

It is not a de Polignac number, because 11909869 - 2¹⁷ = 11778797 is a prime.

It is a super-2 number, since 2×11909869² = 283689959194322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11909879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5954934 + 5954935.

It is an arithmetic number, because the mean of its divisors is an integer number (5954935).

Almost surely, 2^11909869 is an apocalyptic number.

It is an amenable number.

11909869 is a deficient number, since it is larger than the sum of its proper divisors (1).

11909869 is an equidigital number, since it uses as much as digits as its factorization.

11909869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 34992, while the sum is 43.

The square root of 11909869 is about 3451.0678057668. The cubic root of 11909869 is about 228.3682172122.

The spelling of 11909869 in words is "eleven million, nine hundred nine thousand, eight hundred sixty-nine".