143673721 has 2 divisors, whose sum is σ = 143673722. Its totient is φ = 143673720.

The previous prime is 143673671. The next prime is 143673767. The reversal of 143673721 is 127376341.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 98783721 + 44890000 = 9939^2 + 6700^2 .

It is a cyclic number.

It is not a de Polignac number, because 143673721 - 2⁹ = 143673209 is a prime.

It is not a weakly prime, because it can be changed into another prime (143673121) 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 as a sum of consecutive naturals, namely, 71836860 + 71836861.

It is an arithmetic number, because the mean of its divisors is an integer number (71836861).

Almost surely, 2^143673721 is an apocalyptic number.

It is an amenable number.

143673721 is a deficient number, since it is larger than the sum of its proper divisors (1).

143673721 is an equidigital number, since it uses as much as digits as its factorization.

143673721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21168, while the sum is 34.

The square root of 143673721 is about 11986.3973319759. The cubic root of 143673721 is about 523.7521031352.

It can be divided in two parts, 1436 and 73721, that added together give a palindrome (75157).

The spelling of 143673721 in words is "one hundred forty-three million, six hundred seventy-three thousand, seven hundred twenty-one".