505571961 has 4 divisors (see below), whose sum is σ = 674095952. Its totient is φ = 337047972.

The previous prime is 505571953. The next prime is 505571987. The reversal of 505571961 is 169175505.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 505571961 - 2³ = 505571953 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (505571951) 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, 84261991 + ... + 84261996.

It is an arithmetic number, because the mean of its divisors is an integer number (168523988).

Almost surely, 2^505571961 is an apocalyptic number.

It is an amenable number.

505571961 is a deficient number, since it is larger than the sum of its proper divisors (168523991).

505571961 is a wasteful number, since it uses less digits than its factorization.

505571961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168523990.

The product of its (nonzero) digits is 47250, while the sum is 39.

The square root of 505571961 is about 22484.9274181617. The cubic root of 505571961 is about 796.6379536189.

The spelling of 505571961 in words is "five hundred five million, five hundred seventy-one thousand, nine hundred sixty-one".