1263166 has 4 divisors (see below), whose sum is σ = 1894752. Its totient is φ = 631582.

The previous prime is 1263133. The next prime is 1263173. The reversal of 1263166 is 6613621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6613621 = 7 ⋅944803.

It is a self number, because there is not a number n which added to its sum of digits gives 1263166.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 315790 + ... + 315793.

It is an arithmetic number, because the mean of its divisors is an integer number (473688).

2^1263166 is an apocalyptic number.

1263166 is a deficient number, since it is larger than the sum of its proper divisors (631586).

1263166 is an equidigital number, since it uses as much as digits as its factorization.

1263166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 631585.

The product of its digits is 1296, while the sum is 25.

The square root of 1263166 is about 1123.9065797476. The cubic root of 1263166 is about 108.0986181974.

Adding to 1263166 its reverse (6613621), we get a palindrome (7876787).

The spelling of 1263166 in words is "one million, two hundred sixty-three thousand, one hundred sixty-six".