505561431 has 16 divisors (see below), whose sum is σ = 686654208. Its totient is φ = 330792000.

The previous prime is 505561429. The next prime is 505561457. The reversal of 505561431 is 134165505.

It is not a de Polignac number, because 505561431 - 2¹ = 505561429 is a prime.

It is a super-2 number, since 2×505561431² = 511184721029535522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505561471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52006 + ... + 60956.

It is an arithmetic number, because the mean of its divisors is an integer number (42915888).

Almost surely, 2^505561431 is an apocalyptic number.

505561431 is a deficient number, since it is larger than the sum of its proper divisors (181092777).

505561431 is a wasteful number, since it uses less digits than its factorization.

505561431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9302.

The product of its (nonzero) digits is 9000, while the sum is 30.

The square root of 505561431 is about 22484.6932600825. The cubic root of 505561431 is about 796.6324228165.

The spelling of 505561431 in words is "five hundred five million, five hundred sixty-one thousand, four hundred thirty-one".