16391717 has 4 divisors (see below), whose sum is σ = 16455756. Its totient is φ = 16327680.

The previous prime is 16391707. The next prime is 16391741. The reversal of 16391717 is 71719361.

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 13315201 + 3076516 = 3649^2 + 1754^2 .

It is a cyclic number.

It is not a de Polignac number, because 16391717 - 2⁴ = 16391701 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 (16391707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31634 + ... + 32147.

It is an arithmetic number, because the mean of its divisors is an integer number (4113939).

Almost surely, 2^16391717 is an apocalyptic number.

It is an amenable number.

16391717 is a deficient number, since it is larger than the sum of its proper divisors (64039).

16391717 is an equidigital number, since it uses as much as digits as its factorization.

16391717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64038.

The product of its digits is 7938, while the sum is 35.

The square root of 16391717 is about 4048.6685465718. The cubic root of 16391717 is about 254.0240382731.

The spelling of 16391717 in words is "sixteen million, three hundred ninety-one thousand, seven hundred seventeen".