43220557 has 2 divisors, whose sum is σ = 43220558. Its totient is φ = 43220556.

The previous prime is 43220549. The next prime is 43220563. The reversal of 43220557 is 75502234.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30625156 + 12595401 = 5534^2 + 3549^2 .

It is a cyclic number.

It is not a de Polignac number, because 43220557 - 2³ = 43220549 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43220537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21610278 + 21610279.

It is an arithmetic number, because the mean of its divisors is an integer number (21610279).

Almost surely, 2^43220557 is an apocalyptic number.

It is an amenable number.

43220557 is a deficient number, since it is larger than the sum of its proper divisors (1).

43220557 is an equidigital number, since it uses as much as digits as its factorization.

43220557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8400, while the sum is 28.

The square root of 43220557 is about 6574.2343280416. The cubic root of 43220557 is about 350.9377762714.

The spelling of 43220557 in words is "forty-three million, two hundred twenty thousand, five hundred fifty-seven".