55151442 has 40 divisors (see below), whose sum is σ = 125628492. Its totient is φ = 18079200.

The previous prime is 55151419. The next prime is 55151461. The reversal of 55151442 is 24415155.

55151442 is a `hidden beast` number, since 5 + 515 + 144 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 46908801 + 8242641 = 6849^2 + 2871^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 7092 + ... + 12672.

Almost surely, 2^55151442 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55151442, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62814246).

55151442 is an abundant number, since it is smaller than the sum of its proper divisors (70477050).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55151442 is a wasteful number, since it uses less digits than its factorization.

55151442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5656 (or 5647 counting only the distinct ones).

The product of its digits is 4000, while the sum is 27.

The square root of 55151442 is about 7426.4016858772. The cubic root of 55151442 is about 380.6439727008.

Adding to 55151442 its reverse (24415155), we get a palindrome (79566597).

The spelling of 55151442 in words is "fifty-five million, one hundred fifty-one thousand, four hundred forty-two".