16761985 has 4 divisors (see below), whose sum is σ = 20114388. Its totient is φ = 13409584.

The previous prime is 16761977. The next prime is 16762001. The reversal of 16761985 is 58916761.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58916761 = 53 ⋅1111637.

It can be written as a sum of positive squares in 2 ways, for example, as 8071281 + 8690704 = 2841^2 + 2948^2 .

It is a cyclic number.

It is not a de Polignac number, because 16761985 - 2³ = 16761977 is a prime.

It is a super-2 number, since 2×16761985² = 561928282280450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

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, 1676194 + ... + 1676203.

It is an arithmetic number, because the mean of its divisors is an integer number (5028597).

Almost surely, 2^16761985 is an apocalyptic number.

It is an amenable number.

16761985 is a deficient number, since it is larger than the sum of its proper divisors (3352403).

16761985 is an equidigital number, since it uses as much as digits as its factorization.

16761985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3352402.

The product of its digits is 90720, while the sum is 43.

The square root of 16761985 is about 4094.1403249034. The cubic root of 16761985 is about 255.9225076730.

The spelling of 16761985 in words is "sixteen million, seven hundred sixty-one thousand, nine hundred eighty-five".