81245282497 has 8 divisors (see below), whose sum is σ = 82937785640. Its totient is φ = 79564412160.

The previous prime is 81245282491. The next prime is 81245282549. The reversal of 81245282497 is 79428254218.

It can be written as a sum of positive squares in 4 ways, for example, as 26153681841 + 55091600656 = 161721^2 + 234716^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 81245282497 - 2¹¹ = 81245280449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81245282491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2894088 + ... + 2922025.

It is an arithmetic number, because the mean of its divisors is an integer number (10367223205).

Almost surely, 2^81245282497 is an apocalyptic number.

It is an amenable number.

81245282497 is a deficient number, since it is larger than the sum of its proper divisors (1692503143).

81245282497 is a wasteful number, since it uses less digits than its factorization.

81245282497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5816403.

The product of its digits is 2580480, while the sum is 52.

The spelling of 81245282497 in words is "eighty-one billion, two hundred forty-five million, two hundred eighty-two thousand, four hundred ninety-seven".