55940561 has 2 divisors, whose sum is σ = 55940562. Its totient is φ = 55940560.

The previous prime is 55940539. The next prime is 55940581. The reversal of 55940561 is 16504955.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54302161 + 1638400 = 7369^2 + 1280^2 .

It is a cyclic number.

It is not a de Polignac number, because 55940561 - 2⁶ = 55940497 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (55940581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27970280 + 27970281.

It is an arithmetic number, because the mean of its divisors is an integer number (27970281).

Almost surely, 2^55940561 is an apocalyptic number.

It is an amenable number.

55940561 is a deficient number, since it is larger than the sum of its proper divisors (1).

55940561 is an equidigital number, since it uses as much as digits as its factorization.

55940561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27000, while the sum is 35.

The square root of 55940561 is about 7479.3422839178. The cubic root of 55940561 is about 382.4508282584.

The spelling of 55940561 in words is "fifty-five million, nine hundred forty thousand, five hundred sixty-one".