16481431 has 4 divisors (see below), whose sum is σ = 16490632. Its totient is φ = 16472232.

The previous prime is 16481401. The next prime is 16481441. The reversal of 16481431 is 13418461.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 16481431 - 2¹⁷ = 16350359 is a prime.

It is a super-2 number, since 2×16481431² = 543275135615522, which contains 22 as substring.

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 16481431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16481401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 945 + ... + 5818.

It is an arithmetic number, because the mean of its divisors is an integer number (4122658).

Almost surely, 2^16481431 is an apocalyptic number.

16481431 is a deficient number, since it is larger than the sum of its proper divisors (9201).

16481431 is an equidigital number, since it uses as much as digits as its factorization.

16481431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9200.

The product of its digits is 2304, while the sum is 28.

The square root of 16481431 is about 4059.7328729856. The cubic root of 16481431 is about 254.4866308917.

Adding to 16481431 its reverse (13418461), we get a palindrome (29899892).

The spelling of 16481431 in words is "sixteen million, four hundred eighty-one thousand, four hundred thirty-one".