27491213 has 4 divisors (see below), whose sum is σ = 27502140. Its totient is φ = 27480288.

The previous prime is 27491209. The next prime is 27491231. The reversal of 27491213 is 31219472.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 6165289 + 21325924 = 2483^2 + 4618^2 .

It is a cyclic number.

It is not a de Polignac number, because 27491213 - 2² = 27491209 is a prime.

It is a super-2 number, since 2×27491213² = 1511533584422738, 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 (27491273) 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, 431 + ... + 7427.

It is an arithmetic number, because the mean of its divisors is an integer number (6875535).

Almost surely, 2^27491213 is an apocalyptic number.

It is an amenable number.

27491213 is a deficient number, since it is larger than the sum of its proper divisors (10927).

27491213 is an equidigital number, since it uses as much as digits as its factorization.

27491213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10926.

The product of its digits is 3024, while the sum is 29.

The square root of 27491213 is about 5243.2063663373. The cubic root of 27491213 is about 301.8083846540.

The spelling of 27491213 in words is "twenty-seven million, four hundred ninety-one thousand, two hundred thirteen".