55571773 has 2 divisors, whose sum is σ = 55571774. Its totient is φ = 55571772.

The previous prime is 55571741. The next prime is 55571777. The reversal of 55571773 is 37717555.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54567769 + 1004004 = 7387^2 + 1002^2 .

It is a cyclic number.

It is not a de Polignac number, because 55571773 - 2⁵ = 55571741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55571777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27785886 + 27785887.

It is an arithmetic number, because the mean of its divisors is an integer number (27785887).

Almost surely, 2^55571773 is an apocalyptic number.

It is an amenable number.

55571773 is a deficient number, since it is larger than the sum of its proper divisors (1).

55571773 is an equidigital number, since it uses as much as digits as its factorization.

55571773 is an evil number, because the sum of its binary digits is even.

The product of its digits is 128625, while the sum is 40.

The square root of 55571773 is about 7454.6477448636. The cubic root of 55571773 is about 381.6085392515.

The spelling of 55571773 in words is "fifty-five million, five hundred seventy-one thousand, seven hundred seventy-three".