55065121 has 4 divisors (see below), whose sum is σ = 55101744. Its totient is φ = 55028500.

The previous prime is 55065103. The next prime is 55065137. The reversal of 55065121 is 12156055.

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: 12156055 = 5 ⋅2431211.

It is a cyclic number.

It is not a de Polignac number, because 55065121 - 2⁷ = 55064993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55065181) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15955 + ... + 19096.

It is an arithmetic number, because the mean of its divisors is an integer number (13775436).

Almost surely, 2^55065121 is an apocalyptic number.

It is an amenable number.

55065121 is a deficient number, since it is larger than the sum of its proper divisors (36623).

55065121 is a wasteful number, since it uses less digits than its factorization.

55065121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36622.

The product of its (nonzero) digits is 1500, while the sum is 25.

The square root of 55065121 is about 7420.5876451936. The cubic root of 55065121 is about 380.4452790397.

The spelling of 55065121 in words is "fifty-five million, sixty-five thousand, one hundred twenty-one".