55042381 has 8 divisors (see below), whose sum is σ = 58164480. Its totient is φ = 51981072.

The previous prime is 55042367. The next prime is 55042397. The reversal of 55042381 is 18324055.

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 55042381 - 2⁵ = 55042349 is a prime.

It is a super-2 number, since 2×55042381² = 6059327412298322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55042331) 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, 13330 + ... + 16963.

It is an arithmetic number, because the mean of its divisors is an integer number (7270560).

Almost surely, 2^55042381 is an apocalyptic number.

It is an amenable number.

55042381 is a deficient number, since it is larger than the sum of its proper divisors (3122099).

55042381 is a wasteful number, since it uses less digits than its factorization.

55042381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30395.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 55042381 is about 7419.0552633068. The cubic root of 55042381 is about 380.3929015597.

The spelling of 55042381 in words is "fifty-five million, forty-two thousand, three hundred eighty-one".