143979509 has 2 divisors, whose sum is σ = 143979510. Its totient is φ = 143979508.

The previous prime is 143979491. The next prime is 143979533. The reversal of 143979509 is 905979341.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127803025 + 16176484 = 11305^2 + 4022^2 .

It is a cyclic number.

It is not a de Polignac number, because 143979509 - 2²⁰ = 142930933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (143979559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71989754 + 71989755.

It is an arithmetic number, because the mean of its divisors is an integer number (71989755).

Almost surely, 2^143979509 is an apocalyptic number.

It is an amenable number.

143979509 is a deficient number, since it is larger than the sum of its proper divisors (1).

143979509 is an equidigital number, since it uses as much as digits as its factorization.

143979509 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 306180, while the sum is 47.

The square root of 143979509 is about 11999.1461779578. The cubic root of 143979509 is about 524.1234158051.

The spelling of 143979509 in words is "one hundred forty-three million, nine hundred seventy-nine thousand, five hundred nine".