55131442 has 16 divisors (see below), whose sum is σ = 87699672. Its totient is φ = 25903360.

The previous prime is 55131409. The next prime is 55131449. The reversal of 55131442 is 24413155.

It is a happy number.

55131442 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 48986001 + 6145441 = 6999^2 + 2479^2 .

It is not an unprimeable number, because it can be changed into a prime (55131449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39468 + ... + 40840.

Almost surely, 2^55131442 is an apocalyptic number.

55131442 is a deficient number, since it is larger than the sum of its proper divisors (32568230).

55131442 is a wasteful number, since it uses less digits than its factorization.

55131442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2573.

The product of its digits is 2400, while the sum is 25.

The square root of 55131442 is about 7425.0550166312. The cubic root of 55131442 is about 380.5979551680.

Adding to 55131442 its reverse (24413155), we get a palindrome (79544597).

The spelling of 55131442 in words is "fifty-five million, one hundred thirty-one thousand, four hundred forty-two".