16311397 has 4 divisors (see below), whose sum is σ = 16658496. Its totient is φ = 15964300.

The previous prime is 16311377. The next prime is 16311419. The reversal of 16311397 is 79311361.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16311397 - 2¹⁵ = 16278629 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16311307) 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 3 ways as a sum of consecutive naturals, for example, 173479 + ... + 173572.

It is an arithmetic number, because the mean of its divisors is an integer number (4164624).

Almost surely, 2^16311397 is an apocalyptic number.

It is an amenable number.

16311397 is a deficient number, since it is larger than the sum of its proper divisors (347099).

16311397 is an equidigital number, since it uses as much as digits as its factorization.

16311397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 347098.

The product of its digits is 3402, while the sum is 31.

The square root of 16311397 is about 4038.7370550706. The cubic root of 16311397 is about 253.6084497727.

The spelling of 16311397 in words is "sixteen million, three hundred eleven thousand, three hundred ninety-seven".