14563981 has 4 divisors (see below), whose sum is σ = 14592352. Its totient is φ = 14535612.

The previous prime is 14563963. The next prime is 14563999. The reversal of 14563981 is 18936541.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18936541 = 13 ⋅1456657.

It is an interprime number because it is at equal distance from previous prime (14563963) and next prime (14563999).

It is a cyclic number.

It is not a de Polignac number, because 14563981 - 2⁹ = 14563469 is a prime.

It is a super-2 number, since 2×14563981² = 424219085136722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 14563981.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (14560981) 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, 13401 + ... + 14446.

It is an arithmetic number, because the mean of its divisors is an integer number (3648088).

Almost surely, 2^14563981 is an apocalyptic number.

It is an amenable number.

14563981 is a deficient number, since it is larger than the sum of its proper divisors (28371).

14563981 is an equidigital number, since it uses as much as digits as its factorization.

14563981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28370.

The product of its digits is 25920, while the sum is 37.

The square root of 14563981 is about 3816.2784227569. The cubic root of 14563981 is about 244.2080830447.

The spelling of 14563981 in words is "fourteen million, five hundred sixty-three thousand, nine hundred eighty-one".