16923691 has 2 divisors, whose sum is σ = 16923692. Its totient is φ = 16923690.

The previous prime is 16923659. The next prime is 16923701. The reversal of 16923691 is 19632961.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16923691 - 2⁵ = 16923659 is a prime.

It is a super-2 number, since 2×16923691² = 572822634126962, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 16923691.

It is not a weakly prime, because it can be changed into another prime (16923601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8461845 + 8461846.

It is an arithmetic number, because the mean of its divisors is an integer number (8461846).

Almost surely, 2^16923691 is an apocalyptic number.

16923691 is a deficient number, since it is larger than the sum of its proper divisors (1).

16923691 is an equidigital number, since it uses as much as digits as its factorization.

16923691 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17496, while the sum is 37.

The square root of 16923691 is about 4113.8413921784. The cubic root of 16923691 is about 256.7428527045.

The spelling of 16923691 in words is "sixteen million, nine hundred twenty-three thousand, six hundred ninety-one".