505649977 has 4 divisors (see below), whose sum is σ = 577885696. Its totient is φ = 433414260.

The previous prime is 505649953. The next prime is 505649981. The reversal of 505649977 is 779946505.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 505649977 - 2¹¹ = 505647929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (505649987) 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, 36117849 + ... + 36117862.

It is an arithmetic number, because the mean of its divisors is an integer number (144471424).

Almost surely, 2^505649977 is an apocalyptic number.

It is an amenable number.

505649977 is a deficient number, since it is larger than the sum of its proper divisors (72235719).

505649977 is an equidigital number, since it uses as much as digits as its factorization.

505649977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72235718.

The product of its (nonzero) digits is 2381400, while the sum is 52.

The square root of 505649977 is about 22486.6622022923. The cubic root of 505649977 is about 796.6789285376.

The spelling of 505649977 in words is "five hundred five million, six hundred forty-nine thousand, nine hundred seventy-seven".