500055551 has 4 divisors (see below), whose sum is σ = 500499600. Its totient is φ = 499611504.

The previous prime is 500055539. The next prime is 500055559. The reversal of 500055551 is 155550005.

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

It is a cyclic number.

It is not a de Polignac number, because 500055551 - 2⁶ = 500055487 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 500055551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (500055559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220331 + ... + 222588.

It is an arithmetic number, because the mean of its divisors is an integer number (125124900).

Almost surely, 2^500055551 is an apocalyptic number.

500055551 is a deficient number, since it is larger than the sum of its proper divisors (444049).

500055551 is a wasteful number, since it uses less digits than its factorization.

500055551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 444048.

The product of its (nonzero) digits is 3125, while the sum is 26.

The square root of 500055551 is about 22361.9218986204. The cubic root of 500055551 is about 793.7299188009.

The spelling of 500055551 in words is "five hundred million, fifty-five thousand, five hundred fifty-one".