143409991 has 8 divisors (see below), whose sum is σ = 149770080. Its totient is φ = 137060352.

The previous prime is 143409983. The next prime is 143410073. The reversal of 143409991 is 199904341.

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

It is a cyclic number.

It is not a de Polignac number, because 143409991 - 2³ = 143409983 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (143409911) 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, 41415 + ... + 44743.

It is an arithmetic number, because the mean of its divisors is an integer number (18721260).

Almost surely, 2^143409991 is an apocalyptic number.

143409991 is a deficient number, since it is larger than the sum of its proper divisors (6360089).

143409991 is a wasteful number, since it uses less digits than its factorization.

143409991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5225.

The product of its (nonzero) digits is 34992, while the sum is 40.

The square root of 143409991 is about 11975.3910583329. The cubic root of 143409991 is about 523.4314373356.

It can be divided in two parts, 143409 and 991, that added together give a square (144400 = 380²).

The spelling of 143409991 in words is "one hundred forty-three million, four hundred nine thousand, nine hundred ninety-one".