55518481 has 8 divisors (see below), whose sum is σ = 61340544. Its totient is φ = 49980480.

The previous prime is 55518473. The next prime is 55518493. The reversal of 55518481 is 18481555.

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 55518481 - 2³ = 55518473 is a prime.

It is a super-2 number, since 2×55518481² = 6164603465094722, 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 55518481.

It is not an unprimeable number, because it can be changed into a prime (55518581) 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, 70605 + ... + 71386.

It is an arithmetic number, because the mean of its divisors is an integer number (7667568).

Almost surely, 2^55518481 is an apocalyptic number.

It is an amenable number.

55518481 is a deficient number, since it is larger than the sum of its proper divisors (5822063).

55518481 is a wasteful number, since it uses less digits than its factorization.

55518481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142031.

The product of its digits is 32000, while the sum is 37.

The square root of 55518481 is about 7451.0724731410. The cubic root of 55518481 is about 381.4865157527.

The spelling of 55518481 in words is "fifty-five million, five hundred eighteen thousand, four hundred eighty-one".