55536121 has 4 divisors (see below), whose sum is σ = 55551744. Its totient is φ = 55520500.

The previous prime is 55536119. The next prime is 55536133. The reversal of 55536121 is 12163555.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12163555 = 5 ⋅2432711.

It is a cyclic number.

It is not a de Polignac number, because 55536121 - 2¹ = 55536119 is a prime.

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 55536121.

It is not an unprimeable number, because it can be changed into a prime (55536821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 396 + ... + 10546.

It is an arithmetic number, because the mean of its divisors is an integer number (13887936).

Almost surely, 2^55536121 is an apocalyptic number.

It is an amenable number.

55536121 is a deficient number, since it is larger than the sum of its proper divisors (15623).

55536121 is a wasteful number, since it uses less digits than its factorization.

55536121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15622.

The product of its digits is 4500, while the sum is 28.

The square root of 55536121 is about 7452.2561013427. The cubic root of 55536121 is about 381.5269149700.

Adding to 55536121 its reverse (12163555), we get a palindrome (67699676).

The spelling of 55536121 in words is "fifty-five million, five hundred thirty-six thousand, one hundred twenty-one".