16031891 has 4 divisors (see below), whose sum is σ = 16055784. Its totient is φ = 16008000.

The previous prime is 16031849. The next prime is 16031903. The reversal of 16031891 is 19813061.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 16031891 - 2¹⁴ = 16015507 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16030891) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10910 + ... + 12291.

It is an arithmetic number, because the mean of its divisors is an integer number (4013946).

Almost surely, 2^16031891 is an apocalyptic number.

16031891 is a deficient number, since it is larger than the sum of its proper divisors (23893).

16031891 is an equidigital number, since it uses as much as digits as its factorization.

16031891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23892.

The product of its (nonzero) digits is 1296, while the sum is 29.

The square root of 16031891 is about 4003.9843905790. The cubic root of 16031891 is about 252.1515161298.

The spelling of 16031891 in words is "sixteen million, thirty-one thousand, eight hundred ninety-one".