1689935717 has 4 divisors (see below), whose sum is σ = 1691591916. Its totient is φ = 1688279520.

The previous prime is 1689935683. The next prime is 1689935771. The reversal of 1689935717 is 7175399861.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 393863716 + 1296072001 = 19846^2 + 36001^2 .

It is a cyclic number.

It is not a de Polignac number, because 1689935717 - 2¹⁴ = 1689919333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1689934717) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 826568 + ... + 828609.

It is an arithmetic number, because the mean of its divisors is an integer number (422897979).

Almost surely, 2^1689935717 is an apocalyptic number.

It is an amenable number.

1689935717 is a deficient number, since it is larger than the sum of its proper divisors (1656199).

1689935717 is a wasteful number, since it uses less digits than its factorization.

1689935717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1656198.

The product of its digits is 2857680, while the sum is 56.

The square root of 1689935717 is about 41108.8277259277. The cubic root of 1689935717 is about 1191.1233224504.

The spelling of 1689935717 in words is "one billion, six hundred eighty-nine million, nine hundred thirty-five thousand, seven hundred seventeen".