55391305 has 16 divisors (see below), whose sum is σ = 69716880. Its totient is φ = 42190848.

The previous prime is 55391299. The next prime is 55391309. The reversal of 55391305 is 50319355.

It can be written as a sum of positive squares in 8 ways, for example, as 3968064 + 51423241 = 1992^2 + 7171^2 .

It is a cyclic number.

It is not a de Polignac number, because 55391305 - 2¹³ = 55383113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55391309) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7969 + ... + 13201.

It is an arithmetic number, because the mean of its divisors is an integer number (4357305).

Almost surely, 2^55391305 is an apocalyptic number.

It is an amenable number.

55391305 is a deficient number, since it is larger than the sum of its proper divisors (14325575).

55391305 is a wasteful number, since it uses less digits than its factorization.

55391305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5340.

The product of its (nonzero) digits is 10125, while the sum is 31.

The square root of 55391305 is about 7442.5335068107. The cubic root of 55391305 is about 381.1950030854.

It can be divided in two parts, 55391 and 305, that added together give a square (55696 = 236²).

The spelling of 55391305 in words is "fifty-five million, three hundred ninety-one thousand, three hundred five".