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BaseRepresentation
bin100001000100011
3212020002
410020203
51020211
6210215
7100235
oct41043
925202
1016931
11117a2
12996b
137925
146255
15503b
hex4223

16931 has 2 divisors, whose sum is σ = 16932. Its totient is φ = 16930.

The previous prime is 16927. The next prime is 16937. The reversal of 16931 is 13961.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16931 - 22 = 16927 is a prime.

It is a super-2 number, since 2×169312 = 573317522, which contains 22 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (16937) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8465 + 8466.

It is an arithmetic number, because the mean of its divisors is an integer number (8466).

216931 is an apocalyptic number.

16931 is a deficient number, since it is larger than the sum of its proper divisors (1).

16931 is an equidigital number, since it uses as much as digits as its factorization.

16931 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 162, while the sum is 20.

The square root of 16931 is about 130.1191761425. The cubic root of 16931 is about 25.6779808067.

The spelling of 16931 in words is "sixteen thousand, nine hundred thirty-one".