16931245 has 4 divisors (see below), whose sum is σ = 20317500. Its totient is φ = 13544992.

The previous prime is 16931231. The next prime is 16931251. The reversal of 16931245 is 54213961.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54213961 = 73 ⋅742657.

It can be written as a sum of positive squares in 2 ways, for example, as 4674244 + 12257001 = 2162^2 + 3501^2 .

It is a cyclic number.

It is not a de Polignac number, because 16931245 - 2¹⁵ = 16898477 is a prime.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1693120 + ... + 1693129.

It is an arithmetic number, because the mean of its divisors is an integer number (5079375).

Almost surely, 2^16931245 is an apocalyptic number.

It is an amenable number.

16931245 is a deficient number, since it is larger than the sum of its proper divisors (3386255).

16931245 is an equidigital number, since it uses as much as digits as its factorization.

16931245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3386254.

The product of its digits is 6480, while the sum is 31.

The square root of 16931245 is about 4114.7594097347. The cubic root of 16931245 is about 256.7810466387.

The spelling of 16931245 in words is "sixteen million, nine hundred thirty-one thousand, two hundred forty-five".