1263313691 has 4 divisors (see below), whose sum is σ = 1280619432. Its totient is φ = 1246007952.

The previous prime is 1263313679. The next prime is 1263313697. The reversal of 1263313691 is 1963133621.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1263313691 - 2¹⁰ = 1263312667 is a prime.

It is a super-2 number, since 2×1263313691² = 3191922963736086962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1263313697) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8652761 + ... + 8652906.

It is an arithmetic number, because the mean of its divisors is an integer number (320154858).

Almost surely, 2^1263313691 is an apocalyptic number.

1263313691 is a deficient number, since it is larger than the sum of its proper divisors (17305741).

1263313691 is an equidigital number, since it uses as much as digits as its factorization.

1263313691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17305740.

The product of its digits is 17496, while the sum is 35.

The square root of 1263313691 is about 35543.1243843306. The cubic root of 1263313691 is about 1081.0283104322.

The spelling of 1263313691 in words is "one billion, two hundred sixty-three million, three hundred thirteen thousand, six hundred ninety-one".