16123891 has 6 divisors (see below), whose sum is σ = 18756420. Its totient is φ = 13820436.

The previous prime is 16123883. The next prime is 16123901. The reversal of 16123891 is 19832161.

It is not a de Polignac number, because 16123891 - 2³ = 16123883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16123831) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 164481 + ... + 164578.

It is an arithmetic number, because the mean of its divisors is an integer number (3126070).

Almost surely, 2^16123891 is an apocalyptic number.

16123891 is a deficient number, since it is larger than the sum of its proper divisors (2632529).

16123891 is an equidigital number, since it uses as much as digits as its factorization.

16123891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 329073 (or 329066 counting only the distinct ones).

The product of its digits is 2592, while the sum is 31.

The square root of 16123891 is about 4015.4565120295. The cubic root of 16123891 is about 252.6329254687.

The spelling of 16123891 in words is "sixteen million, one hundred twenty-three thousand, eight hundred ninety-one".