97720281583 has 2 divisors, whose sum is σ = 97720281584. Its totient is φ = 97720281582.

The previous prime is 97720281577. The next prime is 97720281649. The reversal of 97720281583 is 38518202779.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 97720281583 - 2¹⁷ = 97720150511 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 97720281583.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97720281523) 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, 48860140791 + 48860140792.

It is an arithmetic number, because the mean of its divisors is an integer number (48860140792).

Almost surely, 2^97720281583 is an apocalyptic number.

97720281583 is a deficient number, since it is larger than the sum of its proper divisors (1).

97720281583 is an equidigital number, since it uses as much as digits as its factorization.

97720281583 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1693440, while the sum is 52.

The spelling of 97720281583 in words is "ninety-seven billion, seven hundred twenty million, two hundred eighty-one thousand, five hundred eighty-three".