12201869 has 6 divisors (see below), whose sum is σ = 12962154. Its totient is φ = 11483840.

The previous prime is 12201859. The next prime is 12201881. The reversal of 12201869 is 96810221.

It can be written as a sum of positive squares in 3 ways, for example, as 8779369 + 3422500 = 2963^2 + 1850^2 .

It is a de Polignac number, because none of the positive numbers 2^k-12201869 is a prime.

It is a super-2 number, since 2×12201869² = 297771214186322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12201829) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 20822 + ... + 21399.

It is an arithmetic number, because the mean of its divisors is an integer number (2160359).

Almost surely, 2^12201869 is an apocalyptic number.

It is an amenable number.

12201869 is a deficient number, since it is larger than the sum of its proper divisors (760285).

12201869 is an equidigital number, since it uses as much as digits as its factorization.

12201869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42255 (or 42238 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 12201869 is about 3493.1173756403. The cubic root of 12201869 is about 230.2195068870.

It can be divided in two parts, 1220 and 1869, that multiplied together give a triangular number (2280180 = T₂₁₃₅).

The spelling of 12201869 in words is "twelve million, two hundred one thousand, eight hundred sixty-nine".