1681717271 has 4 divisors (see below), whose sum is σ = 1811080152. Its totient is φ = 1552354392.

The previous prime is 1681717267. The next prime is 1681717321. The reversal of 1681717271 is 1727171861.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1727171861 = 193 ⋅8949077.

It is a cyclic number.

It is not a de Polignac number, because 1681717271 - 2² = 1681717267 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 (1681717201) 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, 64681421 + ... + 64681446.

It is an arithmetic number, because the mean of its divisors is an integer number (452770038).

Almost surely, 2^1681717271 is an apocalyptic number.

1681717271 is a deficient number, since it is larger than the sum of its proper divisors (129362881).

1681717271 is a wasteful number, since it uses less digits than its factorization.

1681717271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129362880.

The product of its digits is 32928, while the sum is 41.

The square root of 1681717271 is about 41008.7462744230. The cubic root of 1681717271 is about 1189.1893051893.

The spelling of 1681717271 in words is "one billion, six hundred eighty-one million, seven hundred seventeen thousand, two hundred seventy-one".