16319997 has 12 divisors (see below), whose sum is σ = 24210940. Its totient is φ = 10585728.

The previous prime is 16319977. The next prime is 16319999. The reversal of 16319997 is 79991361.

16319997 is a `hidden beast` number, since 1 + 631 + 9 + 9 + 9 + 7 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 5861241 + 10458756 = 2421^2 + 3234^2 .

It is not a de Polignac number, because 16319997 - 2¹¹ = 16317949 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16319999) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24172 + ... + 24837.

Almost surely, 2^16319997 is an apocalyptic number.

It is an amenable number.

16319997 is a deficient number, since it is larger than the sum of its proper divisors (7890943).

16319997 is a wasteful number, since it uses less digits than its factorization.

16319997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49052 (or 49049 counting only the distinct ones).

The product of its digits is 91854, while the sum is 45.

The square root of 16319997 is about 4039.8016040395. The cubic root of 16319997 is about 253.6530126729.

It can be divided in two parts, 1631 and 9997, that added together give a triangular number (11628 = T₁₅₂).

The spelling of 16319997 in words is "sixteen million, three hundred nineteen thousand, nine hundred ninety-seven".