55245581 has 2 divisors, whose sum is σ = 55245582. Its totient is φ = 55245580.

The previous prime is 55245577. The next prime is 55245599. The reversal of 55245581 is 18554255.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42784681 + 12460900 = 6541^2 + 3530^2 .

It is a cyclic number.

It is not a de Polignac number, because 55245581 - 2² = 55245577 is a prime.

It is a super-3 number, since 3×55245581³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55245511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27622790 + 27622791.

It is an arithmetic number, because the mean of its divisors is an integer number (27622791).

Almost surely, 2^55245581 is an apocalyptic number.

It is an amenable number.

55245581 is a deficient number, since it is larger than the sum of its proper divisors (1).

55245581 is an equidigital number, since it uses as much as digits as its factorization.

55245581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40000, while the sum is 35.

The square root of 55245581 is about 7432.7371136076. The cubic root of 55245581 is about 380.8604256330.

The spelling of 55245581 in words is "fifty-five million, two hundred forty-five thousand, five hundred eighty-one".