531613621 has 12 divisors (see below), whose sum is σ = 667813216. Its totient is φ = 414243720.

The previous prime is 531613609. The next prime is 531613627. The reversal of 531613621 is 126316135.

It is not a de Polignac number, because 531613621 - 2²³ = 523225013 is a prime.

It is a super-2 number, since 2×531613621² = 565226084065463282, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 531613621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531613627) 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, 312975 + ... + 314668.

Almost surely, 2^531613621 is an apocalyptic number.

It is an amenable number.

531613621 is a deficient number, since it is larger than the sum of its proper divisors (136199595).

531613621 is a wasteful number, since it uses less digits than its factorization.

531613621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 627672 (or 627661 counting only the distinct ones).

The product of its digits is 3240, while the sum is 28.

The square root of 531613621 is about 23056.7478409250. The cubic root of 531613621 is about 810.0876910600.

Adding to 531613621 its reverse (126316135), we get a palindrome (657929756).

The spelling of 531613621 in words is "five hundred thirty-one million, six hundred thirteen thousand, six hundred twenty-one".