55303181 has 2 divisors, whose sum is σ = 55303182. Its totient is φ = 55303180.

The previous prime is 55303169. The next prime is 55303187. The reversal of 55303181 is 18130355.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29800681 + 25502500 = 5459^2 + 5050^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55303181 is a prime.

It is a super-2 number, since 2×55303181² = 6116883657437522, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55303181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55303187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27651590 + 27651591.

It is an arithmetic number, because the mean of its divisors is an integer number (27651591).

Almost surely, 2^55303181 is an apocalyptic number.

It is an amenable number.

55303181 is a deficient number, since it is larger than the sum of its proper divisors (1).

55303181 is an equidigital number, since it uses as much as digits as its factorization.

55303181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1800, while the sum is 26.

The square root of 55303181 is about 7436.6108544148. The cubic root of 55303181 is about 380.9927435510.

The spelling of 55303181 in words is "fifty-five million, three hundred three thousand, one hundred eighty-one".