27161257 has 4 divisors (see below), whose sum is σ = 28758996. Its totient is φ = 25563520.

The previous prime is 27161249. The next prime is 27161327. The reversal of 27161257 is 75216172.

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 25512601 + 1648656 = 5051^2 + 1284^2 .

It is a cyclic number.

It is not a de Polignac number, because 27161257 - 2³ = 27161249 is a prime.

It is a super-3 number, since 3×27161257³ (a number of 23 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (27161207) 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, 798844 + ... + 798877.

It is an arithmetic number, because the mean of its divisors is an integer number (7189749).

Almost surely, 2^27161257 is an apocalyptic number.

It is an amenable number.

27161257 is a deficient number, since it is larger than the sum of its proper divisors (1597739).

27161257 is a wasteful number, since it uses less digits than its factorization.

27161257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1597738.

The product of its digits is 5880, while the sum is 31.

The square root of 27161257 is about 5211.6462850044. The cubic root of 27161257 is about 300.5960630599.

The spelling of 27161257 in words is "twenty-seven million, one hundred sixty-one thousand, two hundred fifty-seven".