14531981 has 4 divisors (see below), whose sum is σ = 14675964. Its totient is φ = 14388000.

The previous prime is 14531899. The next prime is 14532019. The reversal of 14531981 is 18913541.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8236900 + 6295081 = 2870^2 + 2509^2 .

It is a cyclic number.

It is not a de Polignac number, because 14531981 - 2¹⁴ = 14515597 is a prime.

It is a super-2 number, since 2×14531981² = 422356943568722, 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 (14531081) 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, 71840 + ... + 72041.

It is an arithmetic number, because the mean of its divisors is an integer number (3668991).

Almost surely, 2^14531981 is an apocalyptic number.

It is an amenable number.

14531981 is a deficient number, since it is larger than the sum of its proper divisors (143983).

14531981 is a wasteful number, since it uses less digits than its factorization.

14531981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143982.

The product of its digits is 4320, while the sum is 32.

The square root of 14531981 is about 3812.0835510256. The cubic root of 14531981 is about 244.0290937717.

The spelling of 14531981 in words is "fourteen million, five hundred thirty-one thousand, nine hundred eighty-one".