1720311984523 has 16 divisors (see below), whose sum is σ = 1987181030016. Its totient is φ = 1471863437440.

The previous prime is 1720311984509. The next prime is 1720311984527. The reversal of 1720311984523 is 3254891130271.

It is not a de Polignac number, because 1720311984523 - 2²⁹ = 1719775113611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1720311984527) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4639140 + ... + 4996222.

It is an arithmetic number, because the mean of its divisors is an integer number (124198814376).

Almost surely, 2^{1720311984523} is an apocalyptic number.

1720311984523 is a deficient number, since it is larger than the sum of its proper divisors (266869045493).

1720311984523 is a wasteful number, since it uses less digits than its factorization.

1720311984523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382874.

The product of its (nonzero) digits is 362880, while the sum is 46.

The spelling of 1720311984523 in words is "one trillion, seven hundred twenty billion, three hundred eleven million, nine hundred eighty-four thousand, five hundred twenty-three".