27129493 has 2 divisors, whose sum is σ = 27129494. Its totient is φ = 27129492.

The previous prime is 27129491. The next prime is 27129499. The reversal of 27129493 is 39492172.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24383844 + 2745649 = 4938^2 + 1657^2 .

It is a cyclic number.

It is not a de Polignac number, because 27129493 - 2¹ = 27129491 is a prime.

Together with 27129491, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27129491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13564746 + 13564747.

It is an arithmetic number, because the mean of its divisors is an integer number (13564747).

Almost surely, 2^27129493 is an apocalyptic number.

It is an amenable number.

27129493 is a deficient number, since it is larger than the sum of its proper divisors (1).

27129493 is an equidigital number, since it uses as much as digits as its factorization.

27129493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 37.

The square root of 27129493 is about 5208.5979879426. The cubic root of 27129493 is about 300.4788390078.

The spelling of 27129493 in words is "twenty-seven million, one hundred twenty-nine thousand, four hundred ninety-three".