27129013 has 2 divisors, whose sum is σ = 27129014. Its totient is φ = 27129012.

The previous prime is 27128987. The next prime is 27129019. The reversal of 27129013 is 31092172.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26193924 + 935089 = 5118^2 + 967^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27129013 is a prime.

It is a super-4 number, since 4×27129013⁴ (a number of 31 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27129019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13564506 + 13564507.

It is an arithmetic number, because the mean of its divisors is an integer number (13564507).

Almost surely, 2^27129013 is an apocalyptic number.

It is an amenable number.

27129013 is a deficient number, since it is larger than the sum of its proper divisors (1).

27129013 is an equidigital number, since it uses as much as digits as its factorization.

27129013 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 27129013 is about 5208.5519100802. The cubic root of 27129013 is about 300.4770668811.

The spelling of 27129013 in words is "twenty-seven million, one hundred twenty-nine thousand, thirteen".