1268181 has 6 divisors (see below), whose sum is σ = 1831830. Its totient is φ = 845448.

The previous prime is 1268177. The next prime is 1268207. The reversal of 1268181 is 1818621.

It can be written as a sum of positive squares in only one way, i.e., 1134225 + 133956 = 1065^2 + 366^2 .

It is not a de Polignac number, because 1268181 - 2² = 1268177 is a prime.

It is a super-2 number, since 2×1268181² = 3216566097522, which contains 22 as substring.

1268181 is a modest number, since divided by 8181 gives 126 as remainder.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1268681) 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, 70446 + ... + 70463.

It is an arithmetic number, because the mean of its divisors is an integer number (305305).

2^1268181 is an apocalyptic number.

It is an amenable number.

1268181 is a deficient number, since it is larger than the sum of its proper divisors (563649).

1268181 is a wasteful number, since it uses less digits than its factorization.

1268181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140915 (or 140912 counting only the distinct ones).

The product of its digits is 768, while the sum is 27.

The square root of 1268181 is about 1126.1354270247. The cubic root of 1268181 is about 108.2414863866.

The spelling of 1268181 in words is "one million, two hundred sixty-eight thousand, one hundred eighty-one".