27312515261 has 2 divisors, whose sum is σ = 27312515262. Its totient is φ = 27312515260.

The previous prime is 27312515221. The next prime is 27312515291. The reversal of 27312515261 is 16251521372.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26087095225 + 1225420036 = 161515^2 + 35006^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27312515261 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (27312515221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13656257630 + 13656257631.

It is an arithmetic number, because the mean of its divisors is an integer number (13656257631).

Almost surely, 2^27312515261 is an apocalyptic number.

It is an amenable number.

27312515261 is a deficient number, since it is larger than the sum of its proper divisors (1).

27312515261 is an equidigital number, since it uses as much as digits as its factorization.

27312515261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25200, while the sum is 35.

The spelling of 27312515261 in words is "twenty-seven billion, three hundred twelve million, five hundred fifteen thousand, two hundred sixty-one".