55831281 has 32 divisors (see below), whose sum is σ = 89745408. Its totient is φ = 30455040.

The previous prime is 55831271. The next prime is 55831333. The reversal of 55831281 is 18213855.

It is a happy number.

It is not a de Polignac number, because 55831281 - 2¹⁵ = 55798513 is a prime.

It is a super-2 number, since 2×55831281² = 6234263876201922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (55831271) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 10740 + ... + 15066.

It is an arithmetic number, because the mean of its divisors is an integer number (2804544).

Almost surely, 2^55831281 is an apocalyptic number.

55831281 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

55831281 is a deficient number, since it is larger than the sum of its proper divisors (33914127).

55831281 is a wasteful number, since it uses less digits than its factorization.

55831281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4381.

The product of its digits is 9600, while the sum is 33.

The square root of 55831281 is about 7472.0332574206. The cubic root of 55831281 is about 382.2016264248.

The spelling of 55831281 in words is "fifty-five million, eight hundred thirty-one thousand, two hundred eighty-one".