13411981 has 4 divisors (see below), whose sum is σ = 14631264. Its totient is φ = 12192700.

The previous prime is 13411969. The next prime is 13411987. The reversal of 13411981 is 18911431.

13411981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13411981 - 2¹⁵ = 13379213 is a prime.

It is a super-2 number, since 2×13411981² = 359762468688722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13411987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 609625 + ... + 609646.

It is an arithmetic number, because the mean of its divisors is an integer number (3657816).

Almost surely, 2^13411981 is an apocalyptic number.

13411981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13411981 is a deficient number, since it is larger than the sum of its proper divisors (1219283).

13411981 is a wasteful number, since it uses less digits than its factorization.

13411981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1219282.

The product of its digits is 864, while the sum is 28.

The square root of 13411981 is about 3662.2371578040. The cubic root of 13411981 is about 237.5915421814.

The spelling of 13411981 in words is "thirteen million, four hundred eleven thousand, nine hundred eighty-one".