55500381 has 24 divisors (see below), whose sum is σ = 82162080. Its totient is φ = 36088416.

The previous prime is 55500371. The next prime is 55500391. The reversal of 55500381 is 18300555.

It is an interprime number because it is at equal distance from previous prime (55500371) and next prime (55500391).

It is not a de Polignac number, because 55500381 - 2⁶ = 55500317 is a prime.

It is a super-2 number, since 2×55500381² = 6160584582290322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55500331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 146250 + ... + 146628.

It is an arithmetic number, because the mean of its divisors is an integer number (3423420).

Almost surely, 2^55500381 is an apocalyptic number.

It is an amenable number.

55500381 is a deficient number, since it is larger than the sum of its proper divisors (26661699).

55500381 is a wasteful number, since it uses less digits than its factorization.

55500381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 745 (or 742 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The square root of 55500381 is about 7449.8577838775. The cubic root of 55500381 is about 381.4450541449.

The spelling of 55500381 in words is "fifty-five million, five hundred thousand, three hundred eighty-one".