1263494311 has 4 divisors (see below), whose sum is σ = 1304252224. Its totient is φ = 1222736400.

The previous prime is 1263494273. The next prime is 1263494329. The reversal of 1263494311 is 1134943621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1134943621 = 7 ⋅162134803.

It is a cyclic number.

It is not a de Polignac number, because 1263494311 - 2²⁷ = 1129276583 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1263494341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20378910 + ... + 20378971.

It is an arithmetic number, because the mean of its divisors is an integer number (326063056).

Almost surely, 2^1263494311 is an apocalyptic number.

1263494311 is a deficient number, since it is larger than the sum of its proper divisors (40757913).

1263494311 is an equidigital number, since it uses as much as digits as its factorization.

1263494311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40757912.

The product of its digits is 15552, while the sum is 34.

The square root of 1263494311 is about 35545.6651506200. The cubic root of 1263494311 is about 1081.0798273357.

The spelling of 1263494311 in words is "one billion, two hundred sixty-three million, four hundred ninety-four thousand, three hundred eleven".