55309331 has 8 divisors (see below), whose sum is σ = 68957184. Its totient is φ = 43098120.

The previous prime is 55309327. The next prime is 55309333. The reversal of 55309331 is 13390355.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 55309331 - 2² = 55309327 is a prime.

It is a super-2 number, since 2×55309331² = 6118244191335122, 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 = 55309294 and 55309303.

It is not an unprimeable number, because it can be changed into a prime (55309333) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 359075 + ... + 359228.

It is an arithmetic number, because the mean of its divisors is an integer number (8619648).

Almost surely, 2^55309331 is an apocalyptic number.

55309331 is a deficient number, since it is larger than the sum of its proper divisors (13647853).

55309331 is a wasteful number, since it uses less digits than its factorization.

55309331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718321.

The product of its (nonzero) digits is 6075, while the sum is 29.

The square root of 55309331 is about 7437.0243377308. The cubic root of 55309331 is about 381.0068658159.

Adding to 55309331 its reverse (13390355), we get a palindrome (68699686).

The spelling of 55309331 in words is "fifty-five million, three hundred nine thousand, three hundred thirty-one".