27481381 has 2 divisors, whose sum is σ = 27481382. Its totient is φ = 27481380.

The previous prime is 27481373. The next prime is 27481409. The reversal of 27481381 is 18318472.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27196225 + 285156 = 5215^2 + 534^2 .

It is a cyclic number.

It is not a de Polignac number, because 27481381 - 2³ = 27481373 is a prime.

It is a super-2 number, since 2×27481381² = 1510452603334322, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27481081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13740690 + 13740691.

It is an arithmetic number, because the mean of its divisors is an integer number (13740691).

Almost surely, 2^27481381 is an apocalyptic number.

It is an amenable number.

27481381 is a deficient number, since it is larger than the sum of its proper divisors (1).

27481381 is an equidigital number, since it uses as much as digits as its factorization.

27481381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10752, while the sum is 34.

The square root of 27481381 is about 5242.2686882685. The cubic root of 27481381 is about 301.7724006244.

The spelling of 27481381 in words is "twenty-seven million, four hundred eighty-one thousand, three hundred eighty-one".