143552221 has 2 divisors, whose sum is σ = 143552222. Its totient is φ = 143552220.

The previous prime is 143552207. The next prime is 143552261. The reversal of 143552221 is 122255341.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127464100 + 16088121 = 11290^2 + 4011^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-143552221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (143552261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71776110 + 71776111.

It is an arithmetic number, because the mean of its divisors is an integer number (71776111).

Almost surely, 2^143552221 is an apocalyptic number.

It is an amenable number.

143552221 is a deficient number, since it is larger than the sum of its proper divisors (1).

143552221 is an equidigital number, since it uses as much as digits as its factorization.

143552221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2400, while the sum is 25.

The square root of 143552221 is about 11981.3280148738. The cubic root of 143552221 is about 523.6044216925.

The spelling of 143552221 in words is "one hundred forty-three million, five hundred fifty-two thousand, two hundred twenty-one".