13381969 has 4 divisors (see below), whose sum is σ = 13396644. Its totient is φ = 13367296.

The previous prime is 13381939. The next prime is 13381993. The reversal of 13381969 is 96918331.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6027025 + 7354944 = 2455^2 + 2712^2 .

It is a cyclic number.

It is not a de Polignac number, because 13381969 - 2⁵ = 13381937 is a prime.

It is a super-2 number, since 2×13381969² = 358154188633922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13381919) 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, 5872 + ... + 7825.

It is an arithmetic number, because the mean of its divisors is an integer number (3349161).

Almost surely, 2^13381969 is an apocalyptic number.

It is an amenable number.

13381969 is a deficient number, since it is larger than the sum of its proper divisors (14675).

13381969 is an equidigital number, since it uses as much as digits as its factorization.

13381969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14674.

The product of its digits is 34992, while the sum is 40.

The square root of 13381969 is about 3658.1373675684. The cubic root of 13381969 is about 237.4141902376.

The spelling of 13381969 in words is "thirteen million, three hundred eighty-one thousand, nine hundred sixty-nine".