55518771 has 16 divisors (see below), whose sum is σ = 92291328. Its totient is φ = 28840800.

The previous prime is 55518761. The next prime is 55518829. The reversal of 55518771 is 17781555.

It is a happy number.

It is not a de Polignac number, because 55518771 - 2⁷ = 55518643 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55518721) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 119940 + ... + 120401.

It is an arithmetic number, because the mean of its divisors is an integer number (5768208).

Almost surely, 2^55518771 is an apocalyptic number.

55518771 is a deficient number, since it is larger than the sum of its proper divisors (36772557).

55518771 is a wasteful number, since it uses less digits than its factorization.

55518771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240362.

The product of its digits is 49000, while the sum is 39.

The square root of 55518771 is about 7451.0919334014. The cubic root of 55518771 is about 381.4871799813.

It can be divided in two parts, 55518 and 771, that multiplied together give a triangular number (42804378 = T₉₂₅₂).

The spelling of 55518771 in words is "fifty-five million, five hundred eighteen thousand, seven hundred seventy-one".