1263181 has 2 divisors, whose sum is σ = 1263182. Its totient is φ = 1263180.

The previous prime is 1263179. The next prime is 1263187. The reversal of 1263181 is 1813621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1190281 + 72900 = 1091^2 + 270^2 .

It is a cyclic number.

It is not a de Polignac number, because 1263181 - 2¹ = 1263179 is a prime.

It is a super-2 number, since 2×1263181² = 3191252477522, which contains 22 as substring.

Together with 1263179, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1263187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 631590 + 631591.

It is an arithmetic number, because the mean of its divisors is an integer number (631591).

2^1263181 is an apocalyptic number.

It is an amenable number.

1263181 is a deficient number, since it is larger than the sum of its proper divisors (1).

1263181 is an equidigital number, since it uses as much as digits as its factorization.

1263181 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288, while the sum is 22.

The square root of 1263181 is about 1123.9132528803. The cubic root of 1263181 is about 108.0990460833.

It can be divided in two parts, 1263 and 181, that added together give a square (1444 = 38²).

The spelling of 1263181 in words is "one million, two hundred sixty-three thousand, one hundred eighty-one".