1263812506 has 16 divisors (see below), whose sum is σ = 2069061120. Its totient is φ = 574181280.

The previous prime is 1263812503. The next prime is 1263812551. The reversal of 1263812506 is 6052183621.

It is not an unprimeable number, because it can be changed into a prime (1263812503) 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 7 ways as a sum of consecutive naturals, for example, 36430 + ... + 62086.

It is an arithmetic number, because the mean of its divisors is an integer number (129316320).

Almost surely, 2^1263812506 is an apocalyptic number.

1263812506 is a deficient number, since it is larger than the sum of its proper divisors (805248614).

1263812506 is a wasteful number, since it uses less digits than its factorization.

1263812506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27909.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 1263812506 is about 35550.1407310857. The cubic root of 1263812506 is about 1081.1705717947.

The spelling of 1263812506 in words is "one billion, two hundred sixty-three million, eight hundred twelve thousand, five hundred six".