55517121 has 24 divisors (see below), whose sum is σ = 92630304. Its totient is φ = 31666560.

The previous prime is 55517093. The next prime is 55517141. The reversal of 55517121 is 12171555.

It is not a de Polignac number, because 55517121 - 2⁹ = 55516609 is a prime.

It is a super-3 number, since 3×55517121³ (a number of 24 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (55517141) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14811 + ... + 18176.

It is an arithmetic number, because the mean of its divisors is an integer number (3859596).

Almost surely, 2^55517121 is an apocalyptic number.

55517121 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

55517121 is a deficient number, since it is larger than the sum of its proper divisors (37113183).

55517121 is a wasteful number, since it uses less digits than its factorization.

55517121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33021 (or 33018 counting only the distinct ones).

The product of its digits is 1750, while the sum is 27.

The square root of 55517121 is about 7450.9812105521. The cubic root of 55517121 is about 381.4834007185.

Adding to 55517121 its reverse (12171555), we get a palindrome (67688676).

The spelling of 55517121 in words is "fifty-five million, five hundred seventeen thousand, one hundred twenty-one".