16933991 has 2 divisors, whose sum is σ = 16933992. Its totient is φ = 16933990.

The previous prime is 16933981. The next prime is 16934033. The reversal of 16933991 is 19933961.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16933991 - 2²² = 12739687 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16933981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8466995 + 8466996.

It is an arithmetic number, because the mean of its divisors is an integer number (8466996).

Almost surely, 2^16933991 is an apocalyptic number.

16933991 is a deficient number, since it is larger than the sum of its proper divisors (1).

16933991 is an equidigital number, since it uses as much as digits as its factorization.

16933991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 39366, while the sum is 41.

The square root of 16933991 is about 4115.0930730665. The cubic root of 16933991 is about 256.7949279301.

The spelling of 16933991 in words is "sixteen million, nine hundred thirty-three thousand, nine hundred ninety-one".