55200001 has 4 divisors (see below), whose sum is σ = 55259604. Its totient is φ = 55140400.

The previous prime is 55199993. The next prime is 55200007. The reversal of 55200001 is 10000255.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 17438976 + 37761025 = 4176^2 + 6145^2 .

It is a cyclic number.

It is not a de Polignac number, because 55200001 - 2³ = 55199993 is a prime.

It is a super-2 number, since 2×55200001² = 6094080220800002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55200007) 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, 28390 + ... + 30271.

It is an arithmetic number, because the mean of its divisors is an integer number (13814901).

Almost surely, 2^55200001 is an apocalyptic number.

It is an amenable number.

55200001 is a deficient number, since it is larger than the sum of its proper divisors (59603).

55200001 is an equidigital number, since it uses as much as digits as its factorization.

55200001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59602.

The product of its (nonzero) digits is 50, while the sum is 13.

The square root of 55200001 is about 7429.6703157004. The cubic root of 55200001 is about 380.7556546919.

Adding to 55200001 its reverse (10000255), we get a palindrome (65200256).

The spelling of 55200001 in words is "fifty-five million, two hundred thousand, one".