505561521 has 16 divisors (see below), whose sum is σ = 714377664. Its totient is φ = 316929024.

The previous prime is 505561517. The next prime is 505561523. The reversal of 505561521 is 125165505.

It is not a de Polignac number, because 505561521 - 2² = 505561517 is a prime.

It is a super-3 number, since 3×505561521³ (a number of 27 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (505561523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62326 + ... + 69968.

It is an arithmetic number, because the mean of its divisors is an integer number (44648604).

Almost surely, 2^505561521 is an apocalyptic number.

505561521 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

505561521 is a deficient number, since it is larger than the sum of its proper divisors (208816143).

505561521 is a wasteful number, since it uses less digits than its factorization.

505561521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8960.

The product of its (nonzero) digits is 7500, while the sum is 30.

The square root of 505561521 is about 22484.6952614439. The cubic root of 505561521 is about 796.6324700886.

The spelling of 505561521 in words is "five hundred five million, five hundred sixty-one thousand, five hundred twenty-one".