13431261 has 8 divisors (see below), whose sum is σ = 17980704. Its totient is φ = 8918000.

The previous prime is 13431251. The next prime is 13431323. The reversal of 13431261 is 16213431.

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 13431261 - 2⁷ = 13431133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13431251) 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, 8166 + ... + 9671.

It is an arithmetic number, because the mean of its divisors is an integer number (2247588).

Almost surely, 2^13431261 is an apocalyptic number.

It is an amenable number.

13431261 is a deficient number, since it is larger than the sum of its proper divisors (4549443).

13431261 is a wasteful number, since it uses less digits than its factorization.

13431261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18091.

The product of its digits is 432, while the sum is 21.

The square root of 13431261 is about 3664.8684833156. The cubic root of 13431261 is about 237.7053352570.

Adding to 13431261 its reverse (16213431), we get a palindrome (29644692).

The spelling of 13431261 in words is "thirteen million, four hundred thirty-one thousand, two hundred sixty-one".