11211869 has 2 divisors, whose sum is σ = 11211870. Its totient is φ = 11211868.

The previous prime is 11211839. The next prime is 11211883. The reversal of 11211869 is 96811211.

11211869 is digitally balanced in base 2 and base 3, because in such bases 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., 9375844 + 1836025 = 3062^2 + 1355^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-11211869 is a prime.

It is a super-2 number, since 2×11211869² = 251412012946322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11211839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5605934 + 5605935.

It is an arithmetic number, because the mean of its divisors is an integer number (5605935).

Almost surely, 2^11211869 is an apocalyptic number.

It is an amenable number.

11211869 is a deficient number, since it is larger than the sum of its proper divisors (1).

11211869 is an equidigital number, since it uses as much as digits as its factorization.

11211869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 864, while the sum is 29.

The square root of 11211869 is about 3348.4129076325. The cubic root of 11211869 is about 223.8167945564.

The spelling of 11211869 in words is "eleven million, two hundred eleven thousand, eight hundred sixty-nine".