55943509 has 2 divisors, whose sum is σ = 55943510. Its totient is φ = 55943508.

The previous prime is 55943491. The next prime is 55943551. The reversal of 55943509 is 90534955.

It is a happy number.

55943509 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54066609 + 1876900 = 7353^2 + 1370^2 .

It is a cyclic number.

It is not a de Polignac number, because 55943509 - 2¹³ = 55935317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55943579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27971754 + 27971755.

It is an arithmetic number, because the mean of its divisors is an integer number (27971755).

Almost surely, 2^55943509 is an apocalyptic number.

It is an amenable number.

55943509 is a deficient number, since it is larger than the sum of its proper divisors (1).

55943509 is an equidigital number, since it uses as much as digits as its factorization.

55943509 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 121500, while the sum is 40.

The square root of 55943509 is about 7479.5393574738. The cubic root of 55943509 is about 382.4575463726.

The spelling of 55943509 in words is "fifty-five million, nine hundred forty-three thousand, five hundred nine".