55225813 has 2 divisors, whose sum is σ = 55225814. Its totient is φ = 55225812.

The previous prime is 55225777. The next prime is 55225817. The reversal of 55225813 is 31852255.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29844369 + 25381444 = 5463^2 + 5038^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55225813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55225817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27612906 + 27612907.

It is an arithmetic number, because the mean of its divisors is an integer number (27612907).

Almost surely, 2^55225813 is an apocalyptic number.

It is an amenable number.

55225813 is a deficient number, since it is larger than the sum of its proper divisors (1).

55225813 is an equidigital number, since it uses as much as digits as its factorization.

55225813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12000, while the sum is 31.

The square root of 55225813 is about 7431.4072018696. The cubic root of 55225813 is about 380.8149936610.

The spelling of 55225813 in words is "fifty-five million, two hundred twenty-five thousand, eight hundred thirteen".