81287298315 has 24 divisors (see below), whose sum is σ = 141685137360. Its totient is φ = 43111024704.

The previous prime is 81287298307. The next prime is 81287298317. The reversal of 81287298315 is 51389278218.

It is not a de Polignac number, because 81287298315 - 2³ = 81287298307 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81287298317) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5037712 + ... + 5053821.

It is an arithmetic number, because the mean of its divisors is an integer number (5903547390).

Almost surely, 2^81287298315 is an apocalyptic number.

81287298315 is a deficient number, since it is larger than the sum of its proper divisors (60397839045).

81287298315 is a wasteful number, since it uses less digits than its factorization.

81287298315 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10091723 (or 10091720 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 54.

The spelling of 81287298315 in words is "eighty-one billion, two hundred eighty-seven million, two hundred ninety-eight thousand, three hundred fifteen".