55391773 has 2 divisors, whose sum is σ = 55391774. Its totient is φ = 55391772.

The previous prime is 55391771. The next prime is 55391851. The reversal of 55391773 is 37719355.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28164249 + 27227524 = 5307^2 + 5218^2 .

It is a cyclic number.

It is not a de Polignac number, because 55391773 - 2¹ = 55391771 is a prime.

Together with 55391771, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55391771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27695886 + 27695887.

It is an arithmetic number, because the mean of its divisors is an integer number (27695887).

Almost surely, 2^55391773 is an apocalyptic number.

It is an amenable number.

55391773 is a deficient number, since it is larger than the sum of its proper divisors (1).

55391773 is an equidigital number, since it uses as much as digits as its factorization.

55391773 is an evil number, because the sum of its binary digits is even.

The product of its digits is 99225, while the sum is 40.

The square root of 55391773 is about 7442.5649476508. The cubic root of 55391773 is about 381.1960766520.

The spelling of 55391773 in words is "fifty-five million, three hundred ninety-one thousand, seven hundred seventy-three".