16491057 has 8 divisors (see below), whose sum is σ = 23987040. Its totient is φ = 9994560.

The previous prime is 16491029. The next prime is 16491089. The reversal of 16491057 is 75019461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16491057 - 2¹⁵ = 16458289 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 499729 = 16491057 / (1 + 6 + 4 + 9 + 1 + 0 + 5 + 7).

It is not an unprimeable number, because it can be changed into a prime (16491157) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 249832 + ... + 249897.

It is an arithmetic number, because the mean of its divisors is an integer number (2998380).

Almost surely, 2^16491057 is an apocalyptic number.

It is an amenable number.

16491057 is a deficient number, since it is larger than the sum of its proper divisors (7495983).

16491057 is a wasteful number, since it uses less digits than its factorization.

16491057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 499743.

The product of its (nonzero) digits is 7560, while the sum is 33.

The square root of 16491057 is about 4060.9182459143. The cubic root of 16491057 is about 254.5361656590.

The spelling of 16491057 in words is "sixteen million, four hundred ninety-one thousand, fifty-seven".