505691531 has 8 divisors (see below), whose sum is σ = 526266720. Its totient is φ = 485325568.

The previous prime is 505691507. The next prime is 505691573. The reversal of 505691531 is 135196505.

It is a happy number.

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 505691531 - 2⁶ = 505691467 is a prime.

It is a super-2 number, since 2×505691531² = 511447849050247922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 505691491 and 505691500.

It is not an unprimeable number, because it can be changed into a prime (505697531) 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, 47366 + ... + 57051.

It is an arithmetic number, because the mean of its divisors is an integer number (65783340).

Almost surely, 2^505691531 is an apocalyptic number.

505691531 is a deficient number, since it is larger than the sum of its proper divisors (20575189).

505691531 is a wasteful number, since it uses less digits than its factorization.

505691531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104613.

The product of its (nonzero) digits is 20250, while the sum is 35.

The square root of 505691531 is about 22487.5861532535. The cubic root of 505691531 is about 796.7007514658.

The spelling of 505691531 in words is "five hundred five million, six hundred ninety-one thousand, five hundred thirty-one".