13781911 has 8 divisors (see below), whose sum is σ = 16191504. Its totient is φ = 11565120.

The previous prime is 13781909. The next prime is 13781927. The reversal of 13781911 is 11918731.

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

It is a cyclic number.

It is not a de Polignac number, because 13781911 - 2¹ = 13781909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13781941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48046 + ... + 48331.

It is an arithmetic number, because the mean of its divisors is an integer number (2023938).

Almost surely, 2^13781911 is an apocalyptic number.

13781911 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

13781911 is a deficient number, since it is larger than the sum of its proper divisors (2409593).

13781911 is a wasteful number, since it uses less digits than its factorization.

13781911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96401.

The product of its digits is 1512, while the sum is 31.

The square root of 13781911 is about 3712.3996282728. The cubic root of 13781911 is about 239.7561817849.

The spelling of 13781911 in words is "thirteen million, seven hundred eighty-one thousand, nine hundred eleven".