143220997 has 2 divisors, whose sum is σ = 143220998. Its totient is φ = 143220996.

The previous prime is 143220967. The next prime is 143221021. The reversal of 143220997 is 799022341.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117809316 + 25411681 = 10854^2 + 5041^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-143220997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (143220947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71610498 + 71610499.

It is an arithmetic number, because the mean of its divisors is an integer number (71610499).

Almost surely, 2^143220997 is an apocalyptic number.

It is an amenable number.

143220997 is a deficient number, since it is larger than the sum of its proper divisors (1).

143220997 is an equidigital number, since it uses as much as digits as its factorization.

143220997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 143220997 is about 11967.4975245454. The cubic root of 143220997 is about 523.2014001563.

The spelling of 143220997 in words is "one hundred forty-three million, two hundred twenty thousand, nine hundred ninety-seven".