55440331 has 4 divisors (see below), whose sum is σ = 55721952. Its totient is φ = 55158712.

The previous prime is 55440317. The next prime is 55440337. The reversal of 55440331 is 13304455.

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 55440331 - 2⁹ = 55439819 is a prime.

It is a super-2 number, since 2×55440331² = 6147260602779122, 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 = 55440296 and 55440305.

It is not an unprimeable number, because it can be changed into a prime (55440337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140515 + ... + 140908.

It is an arithmetic number, because the mean of its divisors is an integer number (13930488).

Almost surely, 2^55440331 is an apocalyptic number.

55440331 is a deficient number, since it is larger than the sum of its proper divisors (281621).

55440331 is a wasteful number, since it uses less digits than its factorization.

55440331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281620.

The product of its (nonzero) digits is 3600, while the sum is 25.

The square root of 55440331 is about 7445.8264148448. The cubic root of 55440331 is about 381.3074332180.

Adding to 55440331 its reverse (13304455), we get a palindrome (68744786).

The spelling of 55440331 in words is "fifty-five million, four hundred forty thousand, three hundred thirty-one".