55305331 has 4 divisors (see below), whose sum is σ = 55322352. Its totient is φ = 55288312.

The previous prime is 55305329. The next prime is 55305359. The reversal of 55305331 is 13350355.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 55305331 - 2¹ = 55305329 is a prime.

It is a super-2 number, since 2×55305331² = 6117359274039122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 55305296 and 55305305.

It is not an unprimeable number, because it can be changed into a prime (55305391) 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, 1951 + ... + 10696.

It is an arithmetic number, because the mean of its divisors is an integer number (13830588).

Almost surely, 2^55305331 is an apocalyptic number.

55305331 is a deficient number, since it is larger than the sum of its proper divisors (17021).

55305331 is a wasteful number, since it uses less digits than its factorization.

55305331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17020.

The product of its (nonzero) digits is 3375, while the sum is 25.

The square root of 55305331 is about 7436.7554081064. The cubic root of 55305331 is about 380.9976807220.

Adding to 55305331 its reverse (13350355), we get a palindrome (68655686).

The spelling of 55305331 in words is "fifty-five million, three hundred five thousand, three hundred thirty-one".