55551442 has 32 divisors (see below), whose sum is σ = 89616384. Its totient is φ = 25779600.

The previous prime is 55551437. The next prime is 55551449. The reversal of 55551442 is 24415555.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (55551449) 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, 178467 + ... + 178777.

It is an arithmetic number, because the mean of its divisors is an integer number (2800512).

Almost surely, 2^55551442 is an apocalyptic number.

55551442 is a deficient number, since it is larger than the sum of its proper divisors (34064942).

55551442 is a wasteful number, since it uses less digits than its factorization.

55551442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 454.

The product of its digits is 20000, while the sum is 31.

The square root of 55551442 is about 7453.2839741955. The cubic root of 55551442 is about 381.5619962607.

Adding to 55551442 its reverse (24415555), we get a palindrome (79966997).

The spelling of 55551442 in words is "fifty-five million, five hundred fifty-one thousand, four hundred forty-two".