16143481 has 4 divisors (see below), whose sum is σ = 16190352. Its totient is φ = 16096612.

The previous prime is 16143469. The next prime is 16143487. The reversal of 16143481 is 18434161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18434161 = 19 ⋅970219.

It is a cyclic number.

It is not a de Polignac number, because 16143481 - 2¹³ = 16135289 is a prime.

It is a super-2 number, since 2×16143481² = 521223957594722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16143487) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22915 + ... + 23608.

It is an arithmetic number, because the mean of its divisors is an integer number (4047588).

Almost surely, 2^16143481 is an apocalyptic number.

It is an amenable number.

16143481 is a deficient number, since it is larger than the sum of its proper divisors (46871).

16143481 is an equidigital number, since it uses as much as digits as its factorization.

16143481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46870.

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

The square root of 16143481 is about 4017.8950956938. The cubic root of 16143481 is about 252.7351976403.

The spelling of 16143481 in words is "sixteen million, one hundred forty-three thousand, four hundred eighty-one".