27533981 has 4 divisors (see below), whose sum is σ = 27750912. Its totient is φ = 27317052.

The previous prime is 27533953. The next prime is 27533993. The reversal of 27533981 is 18933572.

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.

It is a cyclic number.

It is not a de Polignac number, because 27533981 - 2⁶ = 27533917 is a prime.

It is a super-2 number, since 2×27533981² = 1516240219416722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27533941) 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, 108275 + ... + 108528.

It is an arithmetic number, because the mean of its divisors is an integer number (6937728).

Almost surely, 2^27533981 is an apocalyptic number.

It is an amenable number.

27533981 is a deficient number, since it is larger than the sum of its proper divisors (216931).

27533981 is a wasteful number, since it uses less digits than its factorization.

27533981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216930.

The product of its digits is 45360, while the sum is 38.

The square root of 27533981 is about 5247.2832018102. The cubic root of 27533981 is about 301.9648110396.

The spelling of 27533981 in words is "twenty-seven million, five hundred thirty-three thousand, nine hundred eighty-one".