143540121 has 4 divisors (see below), whose sum is σ = 191386832. Its totient is φ = 95693412.

The previous prime is 143540113. The next prime is 143540141. The reversal of 143540121 is 121045341.

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: 121045341 = 3 ⋅40348447.

It is not a de Polignac number, because 143540121 - 2³ = 143540113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (143540101) 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, 23923351 + ... + 23923356.

It is an arithmetic number, because the mean of its divisors is an integer number (47846708).

Almost surely, 2^143540121 is an apocalyptic number.

It is an amenable number.

143540121 is a deficient number, since it is larger than the sum of its proper divisors (47846711).

143540121 is an equidigital number, since it uses as much as digits as its factorization.

143540121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47846710.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 143540121 is about 11980.8230518608. The cubic root of 143540121 is about 523.5897097605.

Adding to 143540121 its reverse (121045341), we get a palindrome (264585462).

The spelling of 143540121 in words is "one hundred forty-three million, five hundred forty thousand, one hundred twenty-one".