13911431 has 4 divisors (see below), whose sum is σ = 13960872. Its totient is φ = 13861992.

The previous prime is 13911421. The next prime is 13911461. The reversal of 13911431 is 13411931.

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 13911431 - 2¹⁴ = 13895047 is a prime.

It is a super-2 number, since 2×13911431² = 387055824935522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13911397 and 13911406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13911421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24296 + ... + 24861.

It is an arithmetic number, because the mean of its divisors is an integer number (3490218).

Almost surely, 2^13911431 is an apocalyptic number.

13911431 is a deficient number, since it is larger than the sum of its proper divisors (49441).

13911431 is an equidigital number, since it uses as much as digits as its factorization.

13911431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49440.

The product of its digits is 324, while the sum is 23.

The square root of 13911431 is about 3729.8030779118. The cubic root of 13911431 is about 240.5049034922.

Subtracting from 13911431 its reverse (13411931), we obtain a triangular number (499500 = T₉₉₉).

The spelling of 13911431 in words is "thirteen million, nine hundred eleven thousand, four hundred thirty-one".