16481391 has 12 divisors (see below), whose sum is σ = 22590792. Its totient is φ = 10687968.

The previous prime is 16481383. The next prime is 16481401. The reversal of 16481391 is 19318461.

It is not a de Polignac number, because 16481391 - 2³ = 16481383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16481291) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2101 + ... + 6113.

It is an arithmetic number, because the mean of its divisors is an integer number (1882566).

Almost surely, 2^16481391 is an apocalyptic number.

16481391 is a deficient number, since it is larger than the sum of its proper divisors (6109401).

16481391 is an equidigital number, since it uses as much as digits as its factorization.

16481391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4090 (or 4053 counting only the distinct ones).

The product of its digits is 5184, while the sum is 33.

The square root of 16481391 is about 4059.7279465501. The cubic root of 16481391 is about 254.4864250141.

The spelling of 16481391 in words is "sixteen million, four hundred eighty-one thousand, three hundred ninety-one".