505220001 has 32 divisors (see below), whose sum is σ = 825818112. Its totient is φ = 270346560.

The previous prime is 505219997. The next prime is 505220003. The reversal of 505220001 is 100022505.

It is not a de Polignac number, because 505220001 - 2² = 505219997 is a prime.

It is not an unprimeable number, because it can be changed into a prime (505220003) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15735 + ... + 35468.

It is an arithmetic number, because the mean of its divisors is an integer number (25806816).

Almost surely, 2^505220001 is an apocalyptic number.

It is an amenable number.

505220001 is a deficient number, since it is larger than the sum of its proper divisors (320598111).

505220001 is a wasteful number, since it uses less digits than its factorization.

505220001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51253.

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

The square root of 505220001 is about 22477.0994792478. The cubic root of 505220001 is about 796.4530476739.

Adding to 505220001 its reverse (100022505), we get a palindrome (605242506).

The spelling of 505220001 in words is "five hundred five million, two hundred twenty thousand, one".