55530381 has 8 divisors (see below), whose sum is σ = 78395904. Its totient is φ = 34842560.

The previous prime is 55530367. The next prime is 55530383. The reversal of 55530381 is 18303555.

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 55530381 - 2⁶ = 55530317 is a prime.

It is a super-2 number, since 2×55530381² = 6167246428010322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55530383) 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, 544365 + ... + 544466.

It is an arithmetic number, because the mean of its divisors is an integer number (9799488).

Almost surely, 2^55530381 is an apocalyptic number.

55530381 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

55530381 is a deficient number, since it is larger than the sum of its proper divisors (22865523).

55530381 is a wasteful number, since it uses less digits than its factorization.

55530381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1088851.

The product of its (nonzero) digits is 9000, while the sum is 30.

The square root of 55530381 is about 7451.8709731181. The cubic root of 55530381 is about 381.5137701320.

The spelling of 55530381 in words is "fifty-five million, five hundred thirty thousand, three hundred eighty-one".