55225861 has 2 divisors, whose sum is σ = 55225862. Its totient is φ = 55225860.

The previous prime is 55225847. The next prime is 55225897. The reversal of 55225861 is 16852255.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50495236 + 4730625 = 7106^2 + 2175^2 .

It is a cyclic number.

It is not a de Polignac number, because 55225861 - 2⁷ = 55225733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55225361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27612930 + 27612931.

It is an arithmetic number, because the mean of its divisors is an integer number (27612931).

Almost surely, 2^55225861 is an apocalyptic number.

It is an amenable number.

55225861 is a deficient number, since it is larger than the sum of its proper divisors (1).

55225861 is an equidigital number, since it uses as much as digits as its factorization.

55225861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24000, while the sum is 34.

The square root of 55225861 is about 7431.4104314053. The cubic root of 55225861 is about 380.8151039905.

The spelling of 55225861 in words is "fifty-five million, two hundred twenty-five thousand, eight hundred sixty-one".