16531693 has 4 divisors (see below), whose sum is σ = 16540000. Its totient is φ = 16523388.

The previous prime is 16531679. The next prime is 16531709. The reversal of 16531693 is 39613561.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 39613561 = 13 ⋅3047197.

It is a cyclic number.

It is not a de Polignac number, because 16531693 - 2¹⁷ = 16400621 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 (16531673) 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, 808 + ... + 5806.

It is an arithmetic number, because the mean of its divisors is an integer number (4135000).

Almost surely, 2^16531693 is an apocalyptic number.

It is an amenable number.

16531693 is a deficient number, since it is larger than the sum of its proper divisors (8307).

16531693 is an equidigital number, since it uses as much as digits as its factorization.

16531693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8306.

The product of its digits is 14580, while the sum is 34.

The square root of 16531693 is about 4065.9184694236. The cubic root of 16531693 is about 254.7450636795.

The spelling of 16531693 in words is "sixteen million, five hundred thirty-one thousand, six hundred ninety-three".