505011001 has 16 divisors (see below), whose sum is σ = 562249728. Its totient is φ = 449744400.

The previous prime is 505010983. The next prime is 505011011. The reversal of 505011001 is 100110505.

It is a cyclic number.

It is not a de Polignac number, because 505011001 - 2⁷ = 505010873 is a prime.

It is a super-2 number, since 2×505011001² = 510072222262044002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (505011011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 125320 + ... + 129286.

It is an arithmetic number, because the mean of its divisors is an integer number (35140608).

Almost surely, 2^505011001 is an apocalyptic number.

It is an amenable number.

505011001 is a deficient number, since it is larger than the sum of its proper divisors (57238727).

505011001 is a wasteful number, since it uses less digits than its factorization.

505011001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4212.

The product of its (nonzero) digits is 25, while the sum is 13.

The square root of 505011001 is about 22472.4498219487. The cubic root of 505011001 is about 796.3432066505.

Adding to 505011001 its reverse (100110505), we get a palindrome (605121506).

The spelling of 505011001 in words is "five hundred five million, eleven thousand, one".