16870517 has 2 divisors, whose sum is σ = 16870518. Its totient is φ = 16870516.

The previous prime is 16870493. The next prime is 16870543. The reversal of 16870517 is 71507861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15673681 + 1196836 = 3959^2 + 1094^2 .

It is an emirp because it is prime and its reverse (71507861) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16870517 - 2⁶ = 16870453 is a prime.

It is a super-2 number, since 2×16870517² = 569228687694578, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16870717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8435258 + 8435259.

It is an arithmetic number, because the mean of its divisors is an integer number (8435259).

Almost surely, 2^16870517 is an apocalyptic number.

It is an amenable number.

16870517 is a deficient number, since it is larger than the sum of its proper divisors (1).

16870517 is an equidigital number, since it uses as much as digits as its factorization.

16870517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11760, while the sum is 35.

The square root of 16870517 is about 4107.3734916611. The cubic root of 16870517 is about 256.4736764427.

The spelling of 16870517 in words is "sixteen million, eight hundred seventy thousand, five hundred seventeen".