505780871 has 4 divisors (see below), whose sum is σ = 507214032. Its totient is φ = 504347712.

The previous prime is 505780867. The next prime is 505780901. The reversal of 505780871 is 178087505.

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 505780871 - 2² = 505780867 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505780811) 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, 716051 + ... + 716756.

It is an arithmetic number, because the mean of its divisors is an integer number (126803508).

Almost surely, 2^505780871 is an apocalyptic number.

505780871 is a deficient number, since it is larger than the sum of its proper divisors (1433161).

505780871 is a wasteful number, since it uses less digits than its factorization.

505780871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1433160.

The product of its (nonzero) digits is 78400, while the sum is 41.

The square root of 505780871 is about 22489.5724948252. The cubic root of 505780871 is about 796.7476661358.

The spelling of 505780871 in words is "five hundred five million, seven hundred eighty thousand, eight hundred seventy-one".