143681 has 4 divisors (see below), whose sum is σ = 149952. Its totient is φ = 137412.

The previous prime is 143677. The next prime is 143687. The reversal of 143681 is 186341.

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: 186341 = 31 ⋅6011.

It is a cyclic number.

It is not a de Polignac number, because 143681 - 2² = 143677 is a prime.

It is a super-2 number, since 2×143681² = 41288459522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23), and also a Moran number because the ratio is a prime number: 6247 = 143681 / (1 + 4 + 3 + 6 + 8 + 1).

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 143681.

It is not an unprimeable number, because it can be changed into a prime (143687) 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, 3101 + ... + 3146.

It is an arithmetic number, because the mean of its divisors is an integer number (37488).

2¹⁴³⁶⁸¹ is an apocalyptic number.

It is an amenable number.

143681 is a deficient number, since it is larger than the sum of its proper divisors (6271).

143681 is an equidigital number, since it uses as much as digits as its factorization.

143681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6270.

The product of its digits is 576, while the sum is 23.

The square root of 143681 is about 379.0527667753. The cubic root of 143681 is about 52.3760948008.

The spelling of 143681 in words is "one hundred forty-three thousand, six hundred eighty-one".