505050551 has 4 divisors (see below), whose sum is σ = 505212504. Its totient is φ = 504888600.

The previous prime is 505050529. The next prime is 505050563. The reversal of 505050551 is 155050505.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-505050551 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 505050551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505050521) 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, 76205 + ... + 82566.

It is an arithmetic number, because the mean of its divisors is an integer number (126303126).

Almost surely, 2^505050551 is an apocalyptic number.

505050551 is a deficient number, since it is larger than the sum of its proper divisors (161953).

505050551 is a wasteful number, since it uses less digits than its factorization.

505050551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161952.

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

The square root of 505050551 is about 22473.3297710864. The cubic root of 505050551 is about 796.3639946806.

The spelling of 505050551 in words is "five hundred five million, fifty thousand, five hundred fifty-one".