143681971 has 6 divisors (see below), whose sum is σ = 151642572. Its totient is φ = 136119420.

The previous prime is 143681959. The next prime is 143681987. The reversal of 143681971 is 179186341.

It is not a de Polignac number, because 143681971 - 2⁵ = 143681939 is a prime.

It is not an unprimeable number, because it can be changed into a prime (143681771) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 198645 + ... + 199366.

It is an arithmetic number, because the mean of its divisors is an integer number (25273762).

Almost surely, 2^143681971 is an apocalyptic number.

143681971 is a deficient number, since it is larger than the sum of its proper divisors (7960601).

143681971 is an equidigital number, since it uses as much as digits as its factorization.

143681971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398049 (or 398030 counting only the distinct ones).

The product of its digits is 36288, while the sum is 40.

The square root of 143681971 is about 11986.7414671378. The cubic root of 143681971 is about 523.7621278684.

The spelling of 143681971 in words is "one hundred forty-three million, six hundred eighty-one thousand, nine hundred seventy-one".