16680531 has 24 divisors (see below), whose sum is σ = 26372304. Its totient is φ = 9347520.

The previous prime is 16680523. The next prime is 16680533. The reversal of 16680531 is 13508661.

It is not a de Polignac number, because 16680531 - 2³ = 16680523 is a prime.

It is a super-2 number, since 2×16680531² = 556480228883922, which contains 22 as substring.

It is a nialpdrome in base 16.

It is not an unprimeable number, because it can be changed into a prime (16680533) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6721 + ... + 8861.

It is an arithmetic number, because the mean of its divisors is an integer number (1098846).

Almost surely, 2^16680531 is an apocalyptic number.

16680531 is a deficient number, since it is larger than the sum of its proper divisors (9691773).

16680531 is a wasteful number, since it uses less digits than its factorization.

16680531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2211 (or 2204 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 16680531 is about 4084.1805787697. The cubic root of 16680531 is about 255.5072869630.

The spelling of 16680531 in words is "sixteen million, six hundred eighty thousand, five hundred thirty-one".