1263668331 has 4 divisors (see below), whose sum is σ = 1684891112. Its totient is φ = 842445552.

The previous prime is 1263668311. The next prime is 1263668353. The reversal of 1263668331 is 1338663621.

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

It is a de Polignac number, because none of the positive numbers 2^k-1263668331 is a prime.

It is a super-2 number, since 2×1263668331² = 3193715301544651122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1263668331.

It is not an unprimeable number, because it can be changed into a prime (1263668311) 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, 210611386 + ... + 210611391.

It is an arithmetic number, because the mean of its divisors is an integer number (421222778).

Almost surely, 2^1263668331 is an apocalyptic number.

1263668331 is a deficient number, since it is larger than the sum of its proper divisors (421222781).

1263668331 is an equidigital number, since it uses as much as digits as its factorization.

1263668331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421222780.

The product of its digits is 93312, while the sum is 39.

The square root of 1263668331 is about 35548.1129035002. The cubic root of 1263668331 is about 1081.1294571266.

The spelling of 1263668331 in words is "one billion, two hundred sixty-three million, six hundred sixty-eight thousand, three hundred thirty-one".