1263113621 has 16 divisors (see below), whose sum is σ = 1606934400. Its totient is φ = 984241440.

The previous prime is 1263113611. The next prime is 1263113633.

1263113621 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 1263113621 - 2⁶ = 1263113557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1263113611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 163616 + ... + 171161.

It is an arithmetic number, because the mean of its divisors is an integer number (100433400).

Almost surely, 2^1263113621 is an apocalyptic number.

1263113621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1263113621 is a deficient number, since it is larger than the sum of its proper divisors (343820779).

1263113621 is an equidigital number, since it uses as much as digits as its factorization.

1263113621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334809 (or 334795 counting only the distinct ones).

The product of its digits is 1296, while the sum is 26.

The square root of 1263113621 is about 35540.3098045023. The cubic root of 1263113621 is about 1080.9712402170.

The spelling of 1263113621 in words is "one billion, two hundred sixty-three million, one hundred thirteen thousand, six hundred twenty-one".