16531918 has 24 divisors (see below), whose sum is σ = 27340200. Its totient is φ = 7491744.

The previous prime is 16531913. The next prime is 16531961. The reversal of 16531918 is 81913561.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16531913) 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 11 ways as a sum of consecutive naturals, for example, 19528 + ... + 20356.

It is an arithmetic number, because the mean of its divisors is an integer number (1139175).

Almost surely, 2^16531918 is an apocalyptic number.

16531918 is a deficient number, since it is larger than the sum of its proper divisors (10808282).

16531918 is a wasteful number, since it uses less digits than its factorization.

16531918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 916 (or 903 counting only the distinct ones).

The product of its digits is 6480, while the sum is 34.

The square root of 16531918 is about 4065.9461383545. The cubic root of 16531918 is about 254.7462193865.

The spelling of 16531918 in words is "sixteen million, five hundred thirty-one thousand, nine hundred eighteen".