1985217717 has 32 divisors (see below), whose sum is σ = 3198361600. Its totient is φ = 1069962048.

The previous prime is 1985217709. The next prime is 1985217719. The reversal of 1985217717 is 7177125891.

It is not a de Polignac number, because 1985217717 - 2³ = 1985217709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1985217719) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 80508 + ... + 102234.

It is an arithmetic number, because the mean of its divisors is an integer number (99948800).

Almost surely, 2^1985217717 is an apocalyptic number.

It is an amenable number.

1985217717 is a deficient number, since it is larger than the sum of its proper divisors (1213143883).

1985217717 is a wasteful number, since it uses less digits than its factorization.

1985217717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21985.

The product of its digits is 246960, while the sum is 48.

The square root of 1985217717 is about 44555.7820826882. The cubic root of 1985217717 is about 1256.8092858404.

The spelling of 1985217717 in words is "one billion, nine hundred eighty-five million, two hundred seventeen thousand, seven hundred seventeen".