1263251913 has 32 divisors (see below), whose sum is σ = 2104903680. Its totient is φ = 654687360.

The previous prime is 1263251909. The next prime is 1263251939. The reversal of 1263251913 is 3191523621.

1263251913 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1263251913 - 2² = 1263251909 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (1263251813) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 95181 + ... + 107637.

It is an arithmetic number, because the mean of its divisors is an integer number (65778240).

Almost surely, 2^1263251913 is an apocalyptic number.

It is an amenable number.

1263251913 is a deficient number, since it is larger than the sum of its proper divisors (841651767).

1263251913 is a wasteful number, since it uses less digits than its factorization.

1263251913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12917.

The product of its digits is 9720, while the sum is 33.

The square root of 1263251913 is about 35542.2553167353. The cubic root of 1263251913 is about 1081.0106888243.

The spelling of 1263251913 in words is "one billion, two hundred sixty-three million, two hundred fifty-one thousand, nine hundred thirteen".