27197381 has 4 divisors (see below), whose sum is σ = 27466764. Its totient is φ = 26928000.

The previous prime is 27197333. The next prime is 27197383. The reversal of 27197381 is 18379172.

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 26061025 + 1136356 = 5105^2 + 1066^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27197381 is a prime.

It is a super-2 number, since 2×27197381² = 1479395066518322, 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 (27197383) 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, 134540 + ... + 134741.

It is an arithmetic number, because the mean of its divisors is an integer number (6866691).

Almost surely, 2^27197381 is an apocalyptic number.

It is an amenable number.

27197381 is a deficient number, since it is larger than the sum of its proper divisors (269383).

27197381 is a wasteful number, since it uses less digits than its factorization.

27197381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269382.

The product of its digits is 21168, while the sum is 38.

The square root of 27197381 is about 5215.1108329546. The cubic root of 27197381 is about 300.7292665387.

The spelling of 27197381 in words is "twenty-seven million, one hundred ninety-seven thousand, three hundred eighty-one".