143471681 has 4 divisors (see below), whose sum is σ = 147349332. Its totient is φ = 139594032.

The previous prime is 143471659. The next prime is 143471701. The reversal of 143471681 is 186174341.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 186174341 = 397 ⋅468953.

It can be written as a sum of positive squares in 2 ways, for example, as 99700225 + 43771456 = 9985^2 + 6616^2 .

It is a cyclic number.

It is not a de Polignac number, because 143471681 - 2¹⁸ = 143209537 is a prime.

It is a super-2 number, since 2×143471681² = 41168246497931522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (143471621) 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, 1938770 + ... + 1938843.

It is an arithmetic number, because the mean of its divisors is an integer number (36837333).

Almost surely, 2^143471681 is an apocalyptic number.

It is an amenable number.

143471681 is a deficient number, since it is larger than the sum of its proper divisors (3877651).

143471681 is an equidigital number, since it uses as much as digits as its factorization.

143471681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3877650.

The product of its digits is 16128, while the sum is 35.

The square root of 143471681 is about 11977.9664801668. The cubic root of 143471681 is about 523.5064805878.

The spelling of 143471681 in words is "one hundred forty-three million, four hundred seventy-one thousand, six hundred eighty-one".