143319721 has 2 divisors, whose sum is σ = 143319722. Its totient is φ = 143319720.

The previous prime is 143319713. The next prime is 143319733. The reversal of 143319721 is 127913341.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120890025 + 22429696 = 10995^2 + 4736^2 .

It is an emirp because it is prime and its reverse (127913341) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 143319721 - 2³ = 143319713 is a prime.

It is not a weakly prime, because it can be changed into another prime (143319521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71659860 + 71659861.

It is an arithmetic number, because the mean of its divisors is an integer number (71659861).

Almost surely, 2^143319721 is an apocalyptic number.

It is an amenable number.

143319721 is a deficient number, since it is larger than the sum of its proper divisors (1).

143319721 is an equidigital number, since it uses as much as digits as its factorization.

143319721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4536, while the sum is 31.

The square root of 143319721 is about 11971.6214858306. The cubic root of 143319721 is about 523.3215889377.

The spelling of 143319721 in words is "one hundred forty-three million, three hundred nineteen thousand, seven hundred twenty-one".