16931947 has 2 divisors, whose sum is σ = 16931948. Its totient is φ = 16931946.

The previous prime is 16931927. The next prime is 16931987. The reversal of 16931947 is 74913961.

It is an a-pointer prime, because the next prime (16931987) can be obtained adding 16931947 to its sum of digits (40).

It is a weak prime.

It is an emirp because it is prime and its reverse (74913961) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16931947 is a prime.

It is not a weakly prime, because it can be changed into another prime (16931927) 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 as a sum of consecutive naturals, namely, 8465973 + 8465974.

It is an arithmetic number, because the mean of its divisors is an integer number (8465974).

Almost surely, 2^16931947 is an apocalyptic number.

16931947 is a deficient number, since it is larger than the sum of its proper divisors (1).

16931947 is an equidigital number, since it uses as much as digits as its factorization.

16931947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 40.

The square root of 16931947 is about 4114.8447115292. The cubic root of 16931947 is about 256.7845954583.

The spelling of 16931947 in words is "sixteen million, nine hundred thirty-one thousand, nine hundred forty-seven".