14215981 has 4 divisors (see below), whose sum is σ = 15309532. Its totient is φ = 13122432.

The previous prime is 14215973. The next prime is 14215987. The reversal of 14215981 is 18951241.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18951241 = 23 ⋅823967.

It can be written as a sum of positive squares in 2 ways, for example, as 1010025 + 13205956 = 1005^2 + 3634^2 .

It is a cyclic number.

It is not a de Polignac number, because 14215981 - 2³ = 14215973 is a prime.

It is a super-2 number, since 2×14215981² = 404188231584722, 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 (14215987) 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, 546756 + ... + 546781.

It is an arithmetic number, because the mean of its divisors is an integer number (3827383).

Almost surely, 2^14215981 is an apocalyptic number.

It is an amenable number.

14215981 is a deficient number, since it is larger than the sum of its proper divisors (1093551).

14215981 is a wasteful number, since it uses less digits than its factorization.

14215981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1093550.

The product of its digits is 2880, while the sum is 31.

The square root of 14215981 is about 3770.4085985474. The cubic root of 14215981 is about 242.2472997335.

The spelling of 14215981 in words is "fourteen million, two hundred fifteen thousand, nine hundred eighty-one".