81246223447 has 2 divisors, whose sum is σ = 81246223448. Its totient is φ = 81246223446.

The previous prime is 81246223423. The next prime is 81246223459. The reversal of 81246223447 is 74432264218.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-81246223447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (81246229447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40623111723 + 40623111724.

It is an arithmetic number, because the mean of its divisors is an integer number (40623111724).

Almost surely, 2^81246223447 is an apocalyptic number.

81246223447 is a deficient number, since it is larger than the sum of its proper divisors (1).

81246223447 is an equidigital number, since it uses as much as digits as its factorization.

81246223447 is an evil number, because the sum of its binary digits is even.

The product of its digits is 516096, while the sum is 43.

The spelling of 81246223447 in words is "eighty-one billion, two hundred forty-six million, two hundred twenty-three thousand, four hundred forty-seven".