523156985 has 12 divisors (see below), whose sum is σ = 676318188. Its totient is φ = 386195136.

The previous prime is 523156981. The next prime is 523156993. The reversal of 523156985 is 589651325.

It can be written as a sum of positive squares in 6 ways, for example, as 303317056 + 219839929 = 17416^2 + 14827^2 .

It is not a de Polignac number, because 523156985 - 2² = 523156981 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (523156981) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 182987 + ... + 185823.

It is an arithmetic number, because the mean of its divisors is an integer number (56359849).

Almost surely, 2^523156985 is an apocalyptic number.

It is an amenable number.

523156985 is a deficient number, since it is larger than the sum of its proper divisors (153161203).

523156985 is an frugal number, since it uses more digits than its factorization.

523156985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5692 (or 2855 counting only the distinct ones).

The product of its digits is 324000, while the sum is 44.

The square root of 523156985 is about 22872.6252319230. The cubic root of 523156985 is about 805.7692247332.

The spelling of 523156985 in words is "five hundred twenty-three million, one hundred fifty-six thousand, nine hundred eighty-five".