16430991 has 16 divisors (see below), whose sum is σ = 23274240. Its totient is φ = 10281600.

The previous prime is 16430989. The next prime is 16431017. The reversal of 16430991 is 19903461.

It is not a de Polignac number, because 16430991 - 2¹ = 16430989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16430191) 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 15 ways as a sum of consecutive naturals, for example, 5166 + ... + 7716.

It is an arithmetic number, because the mean of its divisors is an integer number (1454640).

Almost surely, 2^16430991 is an apocalyptic number.

16430991 is a deficient number, since it is larger than the sum of its proper divisors (6843249).

16430991 is a wasteful number, since it uses less digits than its factorization.

16430991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2686.

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 16430991 is about 4053.5158813060. The cubic root of 16430991 is about 254.2267541295.

The spelling of 16430991 in words is "sixteen million, four hundred thirty thousand, nine hundred ninety-one".