16497891 has 8 divisors (see below), whose sum is σ = 24441360. Its totient is φ = 10998576.

The previous prime is 16497889. The next prime is 16497907. The reversal of 16497891 is 19879461.

It is a happy number.

It is not a de Polignac number, because 16497891 - 2¹ = 16497889 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16497851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 305490 + ... + 305543.

It is an arithmetic number, because the mean of its divisors is an integer number (3055170).

Almost surely, 2^16497891 is an apocalyptic number.

16497891 is a deficient number, since it is larger than the sum of its proper divisors (7943469).

16497891 is an equidigital number, since it uses as much as digits as its factorization.

16497891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611042 (or 611036 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 16497891 is about 4061.7595940676. The cubic root of 16497891 is about 254.5713212775.

The spelling of 16497891 in words is "sixteen million, four hundred ninety-seven thousand, eight hundred ninety-one".