55616121 has 24 divisors (see below), whose sum is σ = 87950304. Its totient is φ = 33586560.

The previous prime is 55616107. The next prime is 55616123. The reversal of 55616121 is 12161655.

It is a happy number.

It is not a de Polignac number, because 55616121 - 2¹¹ = 55614073 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55616123) 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, 32530 + ... + 34196.

It is an arithmetic number, because the mean of its divisors is an integer number (3664596).

Almost surely, 2^55616121 is an apocalyptic number.

It is an amenable number.

55616121 is a deficient number, since it is larger than the sum of its proper divisors (32334183).

55616121 is a wasteful number, since it uses less digits than its factorization.

55616121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2021 (or 2018 counting only the distinct ones).

The product of its digits is 1800, while the sum is 27.

The square root of 55616121 is about 7457.6216718200. The cubic root of 55616121 is about 381.7100240805.

Adding to 55616121 its reverse (12161655), we get a palindrome (67777776).

The spelling of 55616121 in words is "fifty-five million, six hundred sixteen thousand, one hundred twenty-one".