13263981 has 8 divisors (see below), whose sum is σ = 17898720. Its totient is φ = 8735952.

The previous prime is 13263979. The next prime is 13263997. The reversal of 13263981 is 18936231.

13263981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13263981 - 2¹ = 13263979 is a prime.

It is a super-2 number, since 2×13263981² = 351866383936722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13263911) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26386 + ... + 26883.

It is an arithmetic number, because the mean of its divisors is an integer number (2237340).

Almost surely, 2^13263981 is an apocalyptic number.

It is an amenable number.

13263981 is a deficient number, since it is larger than the sum of its proper divisors (4634739).

13263981 is an equidigital number, since it uses as much as digits as its factorization.

13263981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53355.

The product of its digits is 7776, while the sum is 33.

The square root of 13263981 is about 3641.9748763549. The cubic root of 13263981 is about 236.7143739925.

The spelling of 13263981 in words is "thirteen million, two hundred sixty-three thousand, nine hundred eighty-one".