27656129 has 2 divisors, whose sum is σ = 27656130. Its totient is φ = 27656128.

The previous prime is 27656117. The next prime is 27656137. The reversal of 27656129 is 92165672.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26543104 + 1113025 = 5152^2 + 1055^2 .

It is a cyclic number.

It is not a de Polignac number, because 27656129 - 2²⁴ = 10878913 is a prime.

It is a super-2 number, since 2×27656129² = 1529722942529282, which contains 22 as substring.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 27656092 and 27656101.

It is not a weakly prime, because it can be changed into another prime (27656149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13828064 + 13828065.

It is an arithmetic number, because the mean of its divisors is an integer number (13828065).

Almost surely, 2^27656129 is an apocalyptic number.

It is an amenable number.

27656129 is a deficient number, since it is larger than the sum of its proper divisors (1).

27656129 is an equidigital number, since it uses as much as digits as its factorization.

27656129 is an evil number, because the sum of its binary digits is even.

The product of its digits is 45360, while the sum is 38.

The square root of 27656129 is about 5258.9094877170. The cubic root of 27656129 is about 302.4106841930.

The spelling of 27656129 in words is "twenty-seven million, six hundred fifty-six thousand, one hundred twenty-nine".