8061515291 has 2 divisors, whose sum is σ = 8061515292. Its totient is φ = 8061515290.

The previous prime is 8061515219. The next prime is 8061515309. The reversal of 8061515291 is 1925151608.

Together with previous prime (8061515219) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-8061515291 is a prime.

It is not a weakly prime, because it can be changed into another prime (8061515191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4030757645 + 4030757646.

It is an arithmetic number, because the mean of its divisors is an integer number (4030757646).

Almost surely, 2^8061515291 is an apocalyptic number.

8061515291 is a deficient number, since it is larger than the sum of its proper divisors (1).

8061515291 is an equidigital number, since it uses as much as digits as its factorization.

8061515291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21600, while the sum is 38.

The square root of 8061515291 is about 89785.9414997693. The cubic root of 8061515291 is about 2005.1131907499.

Adding to 8061515291 its reverse (1925151608), we get a palindrome (9986666899).

The spelling of 8061515291 in words is "eight billion, sixty-one million, five hundred fifteen thousand, two hundred ninety-one".