531661613 has 6 divisors (see below), whose sum is σ = 618463566. Its totient is φ = 455709912.

The previous prime is 531661609. The next prime is 531661649. The reversal of 531661613 is 316166135.

It can be written as a sum of positive squares in only one way, i.e., 529092004 + 2569609 = 23002^2 + 1603^2 .

It is not a de Polignac number, because 531661613 - 2² = 531661609 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 531661613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531661313) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5425070 + ... + 5425167.

It is an arithmetic number, because the mean of its divisors is an integer number (103077261).

Almost surely, 2^531661613 is an apocalyptic number.

It is an amenable number.

531661613 is a deficient number, since it is larger than the sum of its proper divisors (86801953).

531661613 is a wasteful number, since it uses less digits than its factorization.

531661613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10850251 (or 10850244 counting only the distinct ones).

The product of its digits is 9720, while the sum is 32.

The square root of 531661613 is about 23057.7885539789. The cubic root of 531661613 is about 810.1120675100.

The spelling of 531661613 in words is "five hundred thirty-one million, six hundred sixty-one thousand, six hundred thirteen".