16691331 has 16 divisors (see below), whose sum is σ = 23665824. Its totient is φ = 10427904.

The previous prime is 16691321. The next prime is 16691347. The reversal of 16691331 is 13319661.

It is not a de Polignac number, because 16691331 - 2⁹ = 16690819 is a prime.

It is a super-2 number, since 2×16691331² = 557201061103122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16691321) 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, 14385 + ... + 15501.

It is an arithmetic number, because the mean of its divisors is an integer number (1479114).

Almost surely, 2^16691331 is an apocalyptic number.

16691331 is a deficient number, since it is larger than the sum of its proper divisors (6974493).

16691331 is a wasteful number, since it uses less digits than its factorization.

16691331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1430.

The product of its digits is 2916, while the sum is 30.

The square root of 16691331 is about 4085.5025394681. The cubic root of 16691331 is about 255.5624187683.

The spelling of 16691331 in words is "sixteen million, six hundred ninety-one thousand, three hundred thirty-one".