531631650 has 144 divisors (see below), whose sum is σ = 1535339232. Its totient is φ = 121228800.

The previous prime is 531631649. The next prime is 531631669. The reversal of 531631650 is 56136135.

It is a super-2 number, since 2×531631650² = 565264422563445000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 307689 + ... + 309411.

It is an arithmetic number, because the mean of its divisors is an integer number (10662078).

Almost surely, 2^531631650 is an apocalyptic number.

531631650 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 531631650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (767669616).

531631650 is an abundant number, since it is smaller than the sum of its proper divisors (1003707582).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

531631650 is a wasteful number, since it uses less digits than its factorization.

531631650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1777 (or 1761 counting only the distinct ones).

The product of its (nonzero) digits is 8100, while the sum is 30.

The square root of 531631650 is about 23057.1388077532. The cubic root of 531631650 is about 810.0968486544.

Adding to 531631650 its reverse (56136135), we get a palindrome (587767785).

The spelling of 531631650 in words is "five hundred thirty-one million, six hundred thirty-one thousand, six hundred fifty".