55705121 has 4 divisors (see below), whose sum is σ = 56143872. Its totient is φ = 55266372.

The previous prime is 55705079. The next prime is 55705123. The reversal of 55705121 is 12150755.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 55705121 - 2²² = 51510817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55705123) 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, 219185 + ... + 219438.

It is an arithmetic number, because the mean of its divisors is an integer number (14035968).

Almost surely, 2^55705121 is an apocalyptic number.

It is an amenable number.

55705121 is a deficient number, since it is larger than the sum of its proper divisors (438751).

55705121 is a wasteful number, since it uses less digits than its factorization.

55705121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438750.

The product of its (nonzero) digits is 1750, while the sum is 26.

The square root of 55705121 is about 7463.5863363399. The cubic root of 55705121 is about 381.9135267475.

Adding to 55705121 its reverse (12150755), we get a palindrome (67855876).

The spelling of 55705121 in words is "fifty-five million, seven hundred five thousand, one hundred twenty-one".