1263385313731 has 4 divisors (see below), whose sum is σ = 1263743318200. Its totient is φ = 1263027309264.

The previous prime is 1263385313677. The next prime is 1263385313753. The reversal of 1263385313731 is 1373135833621.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1263385313731 is a prime.

It is a super-2 number, since 2×1263385313731² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1263385310731) 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, 178996941 + ... + 179003998.

It is an arithmetic number, because the mean of its divisors is an integer number (315935829550).

Almost surely, 2^{1263385313731} is an apocalyptic number.

1263385313731 is a deficient number, since it is larger than the sum of its proper divisors (358004469).

1263385313731 is an equidigital number, since it uses as much as digits as its factorization.

1263385313731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 358004468.

The product of its digits is 816480, while the sum is 46.

The spelling of 1263385313731 in words is "one trillion, two hundred sixty-three billion, three hundred eighty-five million, three hundred thirteen thousand, seven hundred thirty-one".