16393331 has 4 divisors (see below), whose sum is σ = 16836432. Its totient is φ = 15950232.

The previous prime is 16393313. The next prime is 16393343. The reversal of 16393331 is 13339361.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16393331 is a prime.

It is a super-2 number, since 2×16393331² = 537482602551122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16393294 and 16393303.

It is not an unprimeable number, because it can be changed into a prime (16393301) 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, 221495 + ... + 221568.

It is an arithmetic number, because the mean of its divisors is an integer number (4209108).

Almost surely, 2^16393331 is an apocalyptic number.

16393331 is a deficient number, since it is larger than the sum of its proper divisors (443101).

16393331 is an equidigital number, since it uses as much as digits as its factorization.

16393331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443100.

The product of its digits is 4374, while the sum is 29.

The square root of 16393331 is about 4048.8678664535. The cubic root of 16393331 is about 254.0323754379.

The spelling of 16393331 in words is "sixteen million, three hundred ninety-three thousand, three hundred thirty-one".