143485721 has 2 divisors, whose sum is σ = 143485722. Its totient is φ = 143485720.

The previous prime is 143485709. The next prime is 143485757. The reversal of 143485721 is 127584341.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 122655625 + 20830096 = 11075^2 + 4564^2 .

It is an emirp because it is prime and its reverse (127584341) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 143485721 - 2¹⁰ = 143484697 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (143485781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71742860 + 71742861.

It is an arithmetic number, because the mean of its divisors is an integer number (71742861).

Almost surely, 2^143485721 is an apocalyptic number.

It is an amenable number.

143485721 is a deficient number, since it is larger than the sum of its proper divisors (1).

143485721 is an equidigital number, since it uses as much as digits as its factorization.

143485721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 26880, while the sum is 35.

The square root of 143485721 is about 11978.5525419393. The cubic root of 143485721 is about 523.5235566435.

The spelling of 143485721 in words is "one hundred forty-three million, four hundred eighty-five thousand, seven hundred twenty-one".