16631506 has 8 divisors (see below), whose sum is σ = 25418124. Its totient is φ = 8158800.

The previous prime is 16631501. The next prime is 16631533. The reversal of 16631506 is 60513661.

It can be written as a sum of positive squares in 2 ways, for example, as 16475481 + 156025 = 4059^2 + 395^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (16631501) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 78345 + ... + 78556.

Almost surely, 2^16631506 is an apocalyptic number.

16631506 is a deficient number, since it is larger than the sum of its proper divisors (8786618).

16631506 is a wasteful number, since it uses less digits than its factorization.

16631506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156956.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 16631506 is about 4078.1743464447. The cubic root of 16631506 is about 255.2567246639.

The spelling of 16631506 in words is "sixteen million, six hundred thirty-one thousand, five hundred six".