55505121 has 16 divisors (see below), whose sum is σ = 84940800. Its totient is φ = 31581648.

The previous prime is 55505081. The next prime is 55505123. The reversal of 55505121 is 12150555.

It is not a de Polignac number, because 55505121 - 2¹⁵ = 55472353 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 55505091 and 55505100.

It is not an unprimeable number, because it can be changed into a prime (55505123) 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, 511 + ... + 10548.

It is an arithmetic number, because the mean of its divisors is an integer number (5308800).

Almost surely, 2^55505121 is an apocalyptic number.

It is an amenable number.

55505121 is a deficient number, since it is larger than the sum of its proper divisors (29435679).

55505121 is a wasteful number, since it uses less digits than its factorization.

55505121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11308.

The product of its (nonzero) digits is 1250, while the sum is 24.

The square root of 55505121 is about 7450.1759039636. The cubic root of 55505121 is about 381.4559129177.

Adding to 55505121 its reverse (12150555), we get a palindrome (67655676).

The spelling of 55505121 in words is "fifty-five million, five hundred five thousand, one hundred twenty-one".