505055551 has 32 divisors (see below), whose sum is σ = 707632128. Its totient is φ = 347466240.

The previous prime is 505055543. The next prime is 505055557. The reversal of 505055551 is 155550505.

It is not a de Polignac number, because 505055551 - 2³ = 505055543 is a prime.

It is a super-2 number, since 2×505055551² = 510162219191827202, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505055557) 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, 12055 + ... + 33991.

It is an arithmetic number, because the mean of its divisors is an integer number (22113504).

Almost surely, 2^505055551 is an apocalyptic number.

505055551 is a deficient number, since it is larger than the sum of its proper divisors (202576577).

505055551 is a wasteful number, since it uses less digits than its factorization.

505055551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21991.

The product of its (nonzero) digits is 15625, while the sum is 31.

The square root of 505055551 is about 22473.4410137834. The cubic root of 505055551 is about 796.3666226728.

The spelling of 505055551 in words is "five hundred five million, fifty-five thousand, five hundred fifty-one".