16311491 has 16 divisors (see below), whose sum is σ = 19497984. Its totient is φ = 13353984.

The previous prime is 16311467. The next prime is 16311509. The reversal of 16311491 is 19411361.

It is not a de Polignac number, because 16311491 - 2¹⁰ = 16310467 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16311491.

It is not an unprimeable number, because it can be changed into a prime (16311791) 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 15 ways as a sum of consecutive naturals, for example, 13571 + ... + 14723.

It is an arithmetic number, because the mean of its divisors is an integer number (1218624).

Almost surely, 2^16311491 is an apocalyptic number.

16311491 is a deficient number, since it is larger than the sum of its proper divisors (3186493).

16311491 is a wasteful number, since it uses less digits than its factorization.

16311491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1250.

The product of its digits is 648, while the sum is 26.

The square root of 16311491 is about 4038.7486923551. The cubic root of 16311491 is about 253.6089369402.

The spelling of 16311491 in words is "sixteen million, three hundred eleven thousand, four hundred ninety-one".