505255549 has 4 divisors (see below), whose sum is σ = 505951264. Its totient is φ = 504559836.

The previous prime is 505255537. The next prime is 505255561. The reversal of 505255549 is 945552505.

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, and also an emirpimes, since its reverse is a distinct semiprime: 945552505 = 5 ⋅189110501.

It is an interprime number because it is at equal distance from previous prime (505255537) and next prime (505255561).

It is a cyclic number.

It is not a de Polignac number, because 505255549 - 2¹¹ = 505253501 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 (505255579) 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, 346767 + ... + 348220.

It is an arithmetic number, because the mean of its divisors is an integer number (126487816).

Almost surely, 2^505255549 is an apocalyptic number.

It is an amenable number.

505255549 is a deficient number, since it is larger than the sum of its proper divisors (695715).

505255549 is an equidigital number, since it uses as much as digits as its factorization.

505255549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 695714.

The product of its (nonzero) digits is 225000, while the sum is 40.

The square root of 505255549 is about 22477.8902257307. The cubic root of 505255549 is about 796.4717270933.

The spelling of 505255549 in words is "five hundred five million, two hundred fifty-five thousand, five hundred forty-nine".