13401331 has 4 divisors (see below), whose sum is σ = 13833664. Its totient is φ = 12969000.

The previous prime is 13401329. The next prime is 13401343. The reversal of 13401331 is 13310431.

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

It is a cyclic number.

It is not a de Polignac number, because 13401331 - 2¹ = 13401329 is a prime.

It is a super-2 number, since 2×13401331² = 359191345143122, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 2.

It is not an unprimeable number, because it can be changed into a prime (13401391) 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, 216120 + ... + 216181.

It is an arithmetic number, because the mean of its divisors is an integer number (3458416).

Almost surely, 2^13401331 is an apocalyptic number.

13401331 is a deficient number, since it is larger than the sum of its proper divisors (432333).

13401331 is an equidigital number, since it uses as much as digits as its factorization.

13401331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432332.

The product of its (nonzero) digits is 108, while the sum is 16.

The square root of 13401331 is about 3660.7828397762. The cubic root of 13401331 is about 237.5286377286.

Adding to 13401331 its reverse (13310431), we get a palindrome (26711762).

It can be divided in two parts, 134013 and 31, that multiplied together give a triangular number (4154403 = T₂₈₈₂).

The spelling of 13401331 in words is "thirteen million, four hundred one thousand, three hundred thirty-one".