27651161 has 2 divisors, whose sum is σ = 27651162. Its totient is φ = 27651160.

The previous prime is 27651149. The next prime is 27651191. The reversal of 27651161 is 16115672.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25563136 + 2088025 = 5056^2 + 1445^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27651161 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (27651191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13825580 + 13825581.

It is an arithmetic number, because the mean of its divisors is an integer number (13825581).

Almost surely, 2^27651161 is an apocalyptic number.

It is an amenable number.

27651161 is a deficient number, since it is larger than the sum of its proper divisors (1).

27651161 is an equidigital number, since it uses as much as digits as its factorization.

27651161 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2520, while the sum is 29.

The square root of 27651161 is about 5258.4371252303. The cubic root of 27651161 is about 302.3925752927.

The spelling of 27651161 in words is "twenty-seven million, six hundred fifty-one thousand, one hundred sixty-one".