81295367247 has 6 divisors (see below), whose sum is σ = 117426641592. Its totient is φ = 54196911492.

The previous prime is 81295367243. The next prime is 81295367249. The reversal of 81295367247 is 74276359218.

It is a happy number.

81295367247 is a `hidden beast` number, since 81 + 2 + 9 + 536 + 7 + 24 + 7 = 666.

It is not a de Polignac number, because 81295367247 - 2² = 81295367243 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 81295367193 and 81295367202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81295367243) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4516409283 + ... + 4516409300.

It is an arithmetic number, because the mean of its divisors is an integer number (19571106932).

Almost surely, 2^81295367247 is an apocalyptic number.

81295367247 is a deficient number, since it is larger than the sum of its proper divisors (36131274345).

81295367247 is a wasteful number, since it uses less digits than its factorization.

81295367247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9032818589 (or 9032818586 counting only the distinct ones).

The product of its digits is 5080320, while the sum is 54.

The spelling of 81295367247 in words is "eighty-one billion, two hundred ninety-five million, three hundred sixty-seven thousand, two hundred forty-seven".