143931009 has 4 divisors (see below), whose sum is σ = 191908016. Its totient is φ = 95954004.

The previous prime is 143931001. The next prime is 143931037. The reversal of 143931009 is 900139341.

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.

It is not a de Polignac number, because 143931009 - 2³ = 143931001 is a prime.

It is a super-2 number, since 2×143931009² = 41432270703516162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (143931001) 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, 23988499 + ... + 23988504.

It is an arithmetic number, because the mean of its divisors is an integer number (47977004).

Almost surely, 2^143931009 is an apocalyptic number.

It is an amenable number.

143931009 is a deficient number, since it is larger than the sum of its proper divisors (47977007).

143931009 is an equidigital number, since it uses as much as digits as its factorization.

143931009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47977006.

The product of its (nonzero) digits is 2916, while the sum is 30.

The square root of 143931009 is about 11997.1250306063. The cubic root of 143931009 is about 524.0645582619.

The spelling of 143931009 in words is "one hundred forty-three million, nine hundred thirty-one thousand, nine".