81298470787 has 2 divisors, whose sum is σ = 81298470788. Its totient is φ = 81298470786.

The previous prime is 81298470769. The next prime is 81298470817. The reversal of 81298470787 is 78707489218.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81298470787 is a prime.

It is not a weakly prime, because it can be changed into another prime (81298420787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40649235393 + 40649235394.

It is an arithmetic number, because the mean of its divisors is an integer number (40649235394).

Almost surely, 2^81298470787 is an apocalyptic number.

81298470787 is a deficient number, since it is larger than the sum of its proper divisors (1).

81298470787 is an equidigital number, since it uses as much as digits as its factorization.

81298470787 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12644352, while the sum is 61.

The spelling of 81298470787 in words is "eighty-one billion, two hundred ninety-eight million, four hundred seventy thousand, seven hundred eighty-seven".