501000055 has 4 divisors (see below), whose sum is σ = 601200072. Its totient is φ = 400800040.

The previous prime is 501000041. The next prime is 501000061. The reversal of 501000055 is 550000105.

501000055 is nontrivially palindromic in base 2.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 501000055 - 2⁵ = 501000023 is a prime.

It is a super-2 number, since 2×501000055² = 502002110220006050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50100001 + ... + 50100010.

It is an arithmetic number, because the mean of its divisors is an integer number (150300018).

Almost surely, 2^501000055 is an apocalyptic number.

501000055 is a deficient number, since it is larger than the sum of its proper divisors (100200017).

501000055 is a wasteful number, since it uses less digits than its factorization.

501000055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100200016.

The product of its (nonzero) digits is 125, while the sum is 16.

The square root of 501000055 is about 22383.0305142087. The cubic root of 501000055 is about 794.2293363673.

Subtracting 501000055 from its reverse (550000105), we obtain a triangular number (49000050 = T₉₈₉₉).

The spelling of 501000055 in words is "five hundred one million, fifty-five", and thus it is an aban number.