27319661 has 2 divisors, whose sum is σ = 27319662. Its totient is φ = 27319660.

The previous prime is 27319637. The next prime is 27319667. The reversal of 27319661 is 16691372.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 27144100 + 175561 = 5210^2 + 419^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27319661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27319667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13659830 + 13659831.

It is an arithmetic number, because the mean of its divisors is an integer number (13659831).

Almost surely, 2^27319661 is an apocalyptic number.

It is an amenable number.

27319661 is a deficient number, since it is larger than the sum of its proper divisors (1).

27319661 is an equidigital number, since it uses as much as digits as its factorization.

27319661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13608, while the sum is 35.

The square root of 27319661 is about 5226.8213093619. The cubic root of 27319661 is about 301.1792878228.

The spelling of 27319661 in words is "twenty-seven million, three hundred nineteen thousand, six hundred sixty-one".