14231981 has 4 divisors (see below), whose sum is σ = 14244252. Its totient is φ = 14219712.

The previous prime is 14231933. The next prime is 14231989. The reversal of 14231981 is 18913241.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18913241 = 419 ⋅45139.

It can be written as a sum of positive squares in 2 ways, for example, as 12187081 + 2044900 = 3491^2 + 1430^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-14231981 is a prime.

It is a super-2 number, since 2×14231981² = 405098566368722, 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 (14231989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4190 + ... + 6783.

It is an arithmetic number, because the mean of its divisors is an integer number (3561063).

Almost surely, 2^14231981 is an apocalyptic number.

It is an amenable number.

14231981 is a deficient number, since it is larger than the sum of its proper divisors (12271).

14231981 is a wasteful number, since it uses less digits than its factorization.

14231981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12270.

The product of its digits is 1728, while the sum is 29.

The square root of 14231981 is about 3772.5297878214. The cubic root of 14231981 is about 242.3381482788.

It can be divided in two parts, 142 and 31981, that added together give a palindrome (32123).

The spelling of 14231981 in words is "fourteen million, two hundred thirty-one thousand, nine hundred eighty-one".