505660091 has 16 divisors (see below), whose sum is σ = 546374400. Its totient is φ = 466427808.

The previous prime is 505660081. The next prime is 505660097. The reversal of 505660091 is 190066505.

It is not a de Polignac number, because 505660091 - 2⁶ = 505660027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (505660097) 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, 323570 + ... + 325128.

It is an arithmetic number, because the mean of its divisors is an integer number (34148400).

Almost surely, 2^505660091 is an apocalyptic number.

505660091 is a deficient number, since it is larger than the sum of its proper divisors (40714309).

505660091 is a wasteful number, since it uses less digits than its factorization.

505660091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2018.

The product of its (nonzero) digits is 8100, while the sum is 32.

The square root of 505660091 is about 22486.8870900354. The cubic root of 505660091 is about 796.6842402205.

The spelling of 505660091 in words is "five hundred five million, six hundred sixty thousand, ninety-one".