143557 has 4 divisors (see below), whose sum is σ = 145260. Its totient is φ = 141856.

The previous prime is 143551. The next prime is 143567. The reversal of 143557 is 755341.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 755341 = 167 ⋅4523.

It can be written as a sum of positive squares in 2 ways, for example, as 57121 + 86436 = 239^2 + 294^2 .

It is a cyclic number.

It is not a de Polignac number, because 143557 - 2¹¹ = 141509 is a prime.

It is a super-2 number, since 2×143557² = 41217224498, which contains 22 as substring.

It is a Duffinian number.

143557 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (143551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 718 + ... + 895.

It is an arithmetic number, because the mean of its divisors is an integer number (36315).

2¹⁴³⁵⁵⁷ is an apocalyptic number.

It is an amenable number.

143557 is a deficient number, since it is larger than the sum of its proper divisors (1703).

143557 is an equidigital number, since it uses as much as digits as its factorization.

143557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1702.

The product of its digits is 2100, while the sum is 25.

The square root of 143557 is about 378.8891658520. The cubic root of 143557 is about 52.3610232070.

Adding to 143557 its reverse (755341), we get a palindrome (898898).

The spelling of 143557 in words is "one hundred forty-three thousand, five hundred fifty-seven".