55305617 has 4 divisors (see below), whose sum is σ = 55875876. Its totient is φ = 54735360.

The previous prime is 55305587. The next prime is 55305647. The reversal of 55305617 is 71650355.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (55305587) and next prime (55305647).

It can be written as a sum of positive squares in 2 ways, for example, as 14868736 + 40436881 = 3856^2 + 6359^2 .

It is a cyclic number.

It is not a de Polignac number, because 55305617 - 2¹⁴ = 55289233 is a prime.

It is a super-2 number, since 2×55305617² = 6117422543501378, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55305647) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 284984 + ... + 285177.

It is an arithmetic number, because the mean of its divisors is an integer number (13968969).

Almost surely, 2^55305617 is an apocalyptic number.

It is an amenable number.

55305617 is a deficient number, since it is larger than the sum of its proper divisors (570259).

55305617 is an equidigital number, since it uses as much as digits as its factorization.

55305617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 570258.

The product of its (nonzero) digits is 15750, while the sum is 32.

The square root of 55305617 is about 7436.7746368974. The cubic root of 55305617 is about 380.9983374709.

The spelling of 55305617 in words is "fifty-five million, three hundred five thousand, six hundred seventeen".