27715381 has 2 divisors, whose sum is σ = 27715382. Its totient is φ = 27715380.

The previous prime is 27715361. The next prime is 27715393. The reversal of 27715381 is 18351772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27562500 + 152881 = 5250^2 + 391^2 .

It is a cyclic number.

It is not a de Polignac number, because 27715381 - 2¹³ = 27707189 is a prime.

It is a super-2 number, since 2×27715381² = 1536284687950322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27715301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13857690 + 13857691.

It is an arithmetic number, because the mean of its divisors is an integer number (13857691).

Almost surely, 2^27715381 is an apocalyptic number.

It is an amenable number.

27715381 is a deficient number, since it is larger than the sum of its proper divisors (1).

27715381 is an equidigital number, since it uses as much as digits as its factorization.

27715381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11760, while the sum is 34.

The square root of 27715381 is about 5264.5399609083. The cubic root of 27715381 is about 302.6264971940.

The spelling of 27715381 in words is "twenty-seven million, seven hundred fifteen thousand, three hundred eighty-one".