1263387495931 has 4 divisors (see below), whose sum is σ = 1378240904664. Its totient is φ = 1148534087200.

The previous prime is 1263387495917. The next prime is 1263387495983. The reversal of 1263387495931 is 1395947833621.

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 1263387495931 - 2⁵ = 1263387495899 is a prime.

It is a super-2 number, since 2×1263387495931² (a number of 25 digits) 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 1263387495931.

It is not an unprimeable number, because it can be changed into a prime (1263387495911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57426704350 + ... + 57426704371.

It is an arithmetic number, because the mean of its divisors is an integer number (344560226166).

Almost surely, 2^{1263387495931} is an apocalyptic number.

1263387495931 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1263387495931 is a deficient number, since it is larger than the sum of its proper divisors (114853408733).

1263387495931 is a wasteful number, since it uses less digits than its factorization.

1263387495931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 114853408732.

The product of its digits is 29393280, while the sum is 61.

The spelling of 1263387495931 in words is "one trillion, two hundred sixty-three billion, three hundred eighty-seven million, four hundred ninety-five thousand, nine hundred thirty-one".