27725381 has 2 divisors, whose sum is σ = 27725382. Its totient is φ = 27725380.

The previous prime is 27725371. The next prime is 27725387. The reversal of 27725381 is 18352772.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27394756 + 330625 = 5234^2 + 575^2 .

It is a cyclic number.

It is not a de Polignac number, because 27725381 - 2¹⁰ = 27724357 is a prime.

It is a super-2 number, since 2×27725381² = 1537393503190322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27725387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13862690 + 13862691.

It is an arithmetic number, because the mean of its divisors is an integer number (13862691).

Almost surely, 2^27725381 is an apocalyptic number.

It is an amenable number.

27725381 is a deficient number, since it is larger than the sum of its proper divisors (1).

27725381 is an equidigital number, since it uses as much as digits as its factorization.

27725381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 23520, while the sum is 35.

The square root of 27725381 is about 5265.4896258563. The cubic root of 27725381 is about 302.6628897549.

The spelling of 27725381 in words is "twenty-seven million, seven hundred twenty-five thousand, three hundred eighty-one".