16931641 has 8 divisors (see below), whose sum is σ = 18008480. Its totient is φ = 15873408.

The previous prime is 16931639. The next prime is 16931659. The reversal of 16931641 is 14613961.

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

It is a cyclic number.

It is not a de Polignac number, because 16931641 - 2¹ = 16931639 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16931671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2751 + ... + 6436.

It is an arithmetic number, because the mean of its divisors is an integer number (2251060).

Almost surely, 2^16931641 is an apocalyptic number.

It is an amenable number.

16931641 is a deficient number, since it is larger than the sum of its proper divisors (1076839).

16931641 is an equidigital number, since it uses as much as digits as its factorization.

16931641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9303.

The product of its digits is 3888, while the sum is 31.

The square root of 16931641 is about 4114.8075289131. The cubic root of 16931641 is about 256.7830485490.

The spelling of 16931641 in words is "sixteen million, nine hundred thirty-one thousand, six hundred forty-one".