55220001 has 4 divisors (see below), whose sum is σ = 73626672. Its totient is φ = 36813332.

The previous prime is 55219991. The next prime is 55220003. The reversal of 55220001 is 10002255.

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 55220001 - 2⁶ = 55219937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55220003) 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, 9203331 + ... + 9203336.

It is an arithmetic number, because the mean of its divisors is an integer number (18406668).

Almost surely, 2^55220001 is an apocalyptic number.

It is an amenable number.

55220001 is a deficient number, since it is larger than the sum of its proper divisors (18406671).

55220001 is a wasteful number, since it uses less digits than its factorization.

55220001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18406670.

The product of its (nonzero) digits is 100, while the sum is 15.

The square root of 55220001 is about 7431.0161485493. The cubic root of 55220001 is about 380.8016341209.

Adding to 55220001 its reverse (10002255), we get a palindrome (65222256).

The spelling of 55220001 in words is "fifty-five million, two hundred twenty thousand, one".