55042681 has 4 divisors (see below), whose sum is σ = 55062864. Its totient is φ = 55022500.

The previous prime is 55042661. The next prime is 55042721. The reversal of 55042681 is 18624055.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 55042681 - 2⁵ = 55042649 is a prime.

It is a super-2 number, since 2×55042681² = 6059393463335522, which contains 22 as substring.

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 Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55042621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5215 + ... + 11716.

It is an arithmetic number, because the mean of its divisors is an integer number (13765716).

Almost surely, 2^55042681 is an apocalyptic number.

It is an amenable number.

55042681 is a deficient number, since it is larger than the sum of its proper divisors (20183).

55042681 is a wasteful number, since it uses less digits than its factorization.

55042681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20182.

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 55042681 is about 7419.0754814869. The cubic root of 55042681 is about 380.3935926494.

The spelling of 55042681 in words is "fifty-five million, forty-two thousand, six hundred eighty-one".