16609531 has 4 divisors (see below), whose sum is σ = 16756632. Its totient is φ = 16462432.

The previous prime is 16609499. The next prime is 16609543. The reversal of 16609531 is 13590661.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 16609531 - 2⁵ = 16609499 is a prime.

It is a super-2 number, since 2×16609531² = 551753040079922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16609493 and 16609502.

It is not an unprimeable number, because it can be changed into a prime (16609331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 73381 + ... + 73606.

It is an arithmetic number, because the mean of its divisors is an integer number (4189158).

Almost surely, 2^16609531 is an apocalyptic number.

16609531 is a deficient number, since it is larger than the sum of its proper divisors (147101).

16609531 is a wasteful number, since it uses less digits than its factorization.

16609531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147100.

The product of its (nonzero) digits is 4860, while the sum is 31.

The square root of 16609531 is about 4075.4792356237. The cubic root of 16609531 is about 255.1442526118.

The spelling of 16609531 in words is "sixteen million, six hundred nine thousand, five hundred thirty-one".