505550001 has 16 divisors (see below), whose sum is σ = 750993408. Its totient is φ = 299874000.

The previous prime is 505549999. The next prime is 505550027. The reversal of 505550001 is 100055505.

It is not a de Polignac number, because 505550001 - 2¹ = 505549999 is a prime.

It is a super-2 number, since 2×505550001² = 511161607022200002, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 505550001.

It is not an unprimeable number, because it can be changed into a prime (505550701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 161425 + ... + 164526.

It is an arithmetic number, because the mean of its divisors is an integer number (46937088).

Almost surely, 2^505550001 is an apocalyptic number.

It is an amenable number.

505550001 is a deficient number, since it is larger than the sum of its proper divisors (245443407).

505550001 is a wasteful number, since it uses less digits than its factorization.

505550001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326012.

The product of its (nonzero) digits is 625, while the sum is 21.

The square root of 505550001 is about 22484.4390857322. The cubic root of 505550001 is about 796.6264192090.

The spelling of 505550001 in words is "five hundred five million, five hundred fifty thousand, one".