143518981 has 8 divisors (see below), whose sum is σ = 152299224. Its totient is φ = 134776320.

The previous prime is 143518961. The next prime is 143519021. The reversal of 143518981 is 189815341.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 13764100 + 129754881 = 3710^2 + 11391^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-143518981 is a prime.

It is a super-2 number, since 2×143518981² = 41195395814556722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (143518961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1320 + ... + 16993.

It is an arithmetic number, because the mean of its divisors is an integer number (19037403).

Almost surely, 2^143518981 is an apocalyptic number.

It is an amenable number.

143518981 is a deficient number, since it is larger than the sum of its proper divisors (8780243).

143518981 is a wasteful number, since it uses less digits than its factorization.

143518981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18791.

The product of its digits is 34560, while the sum is 40.

The square root of 143518981 is about 11979.9407761474. The cubic root of 143518981 is about 523.5640044506.

It can be divided in two parts, 14351 and 8981, that added together give a palindrome (23332).

The spelling of 143518981 in words is "one hundred forty-three million, five hundred eighteen thousand, nine hundred eighty-one".