143917981 has 8 divisors (see below), whose sum is σ = 149022720. Its totient is φ = 138822768.

The previous prime is 143917979. The next prime is 143917993. The reversal of 143917981 is 189719341.

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

It is not a de Polignac number, because 143917981 - 2¹ = 143917979 is a prime.

It is a super-2 number, since 2×143917981² = 41424770510232722, 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 (143917181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 43860 + ... + 47026.

It is an arithmetic number, because the mean of its divisors is an integer number (18627840).

Almost surely, 2^143917981 is an apocalyptic number.

It is an amenable number.

143917981 is a deficient number, since it is larger than the sum of its proper divisors (5104739).

143917981 is a wasteful number, since it uses less digits than its factorization.

143917981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4763.

The product of its digits is 54432, while the sum is 43.

The square root of 143917981 is about 11996.5820549021. The cubic root of 143917981 is about 524.0487457809.

The spelling of 143917981 in words is "one hundred forty-three million, nine hundred seventeen thousand, nine hundred eighty-one".