505121557 has 8 divisors (see below), whose sum is σ = 508079520. Its totient is φ = 502172880.

The previous prime is 505121543. The next prime is 505121563. The reversal of 505121557 is 755121505.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 505121557 - 2²⁷ = 370903829 is a prime.

It is a super-2 number, since 2×505121557² = 510295574692208498, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505121957) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126798 + ... + 130720.

It is an arithmetic number, because the mean of its divisors is an integer number (63509940).

Almost surely, 2^505121557 is an apocalyptic number.

It is an amenable number.

505121557 is a deficient number, since it is larger than the sum of its proper divisors (2957963).

505121557 is a wasteful number, since it uses less digits than its factorization.

505121557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4643.

The product of its (nonzero) digits is 8750, while the sum is 31.

The square root of 505121557 is about 22474.9094992616. The cubic root of 505121557 is about 796.4013136987.

The spelling of 505121557 in words is "five hundred five million, one hundred twenty-one thousand, five hundred fifty-seven".