27131557 has 2 divisors, whose sum is σ = 27131558. Its totient is φ = 27131556.

The previous prime is 27131543. The next prime is 27131569. The reversal of 27131557 is 75513172.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17589636 + 9541921 = 4194^2 + 3089^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27131557 is a prime.

It is a super-2 number, since 2×27131557² = 1472242770488498, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27131537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13565778 + 13565779.

It is an arithmetic number, because the mean of its divisors is an integer number (13565779).

Almost surely, 2^27131557 is an apocalyptic number.

It is an amenable number.

27131557 is a deficient number, since it is larger than the sum of its proper divisors (1).

27131557 is an equidigital number, since it uses as much as digits as its factorization.

27131557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7350, while the sum is 31.

The square root of 27131557 is about 5208.7961181064. The cubic root of 27131557 is about 300.4864589142.

The spelling of 27131557 in words is "twenty-seven million, one hundred thirty-one thousand, five hundred fifty-seven".