84531721759 has 2 divisors, whose sum is σ = 84531721760. Its totient is φ = 84531721758.

The previous prime is 84531721741. The next prime is 84531721783. The reversal of 84531721759 is 95712713548.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84531721759 is a prime.

It is a super-2 number, since 2×84531721759² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84531721739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42265860879 + 42265860880.

It is an arithmetic number, because the mean of its divisors is an integer number (42265860880).

Almost surely, 2^84531721759 is an apocalyptic number.

84531721759 is a deficient number, since it is larger than the sum of its proper divisors (1).

84531721759 is an equidigital number, since it uses as much as digits as its factorization.

84531721759 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2116800, while the sum is 52.

The spelling of 84531721759 in words is "eighty-four billion, five hundred thirty-one million, seven hundred twenty-one thousand, seven hundred fifty-nine".