55112381 has 4 divisors (see below), whose sum is σ = 55185564. Its totient is φ = 55039200.

The previous prime is 55112377. The next prime is 55112399. The reversal of 55112381 is 18321155.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12013156 + 43099225 = 3466^2 + 6565^2 .

It is a cyclic number.

It is not a de Polignac number, because 55112381 - 2² = 55112377 is a prime.

It is a super-2 number, since 2×55112381² = 6074749078978322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 55112381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55112311) 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, 35450 + ... + 36971.

It is an arithmetic number, because the mean of its divisors is an integer number (13796391).

Almost surely, 2^55112381 is an apocalyptic number.

It is an amenable number.

55112381 is a deficient number, since it is larger than the sum of its proper divisors (73183).

55112381 is an equidigital number, since it uses as much as digits as its factorization.

55112381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73182.

The product of its digits is 1200, while the sum is 26.

The square root of 55112381 is about 7423.7713461555. The cubic root of 55112381 is about 380.5540877995.

The spelling of 55112381 in words is "fifty-five million, one hundred twelve thousand, three hundred eighty-one".