5131321650 has 756 divisors, whose sum is σ = 19085412942. Its totient is φ = 1018967040.

The previous prime is 5131321649. The next prime is 5131321651. The reversal of 5131321650 is 561231315.

5131321650 is a `hidden beast` number, since 5 + 1 + 3 + 1 + 3 + 2 + 1 + 650 = 666.

It is an interprime number because it is at equal distance from previous prime (5131321649) and next prime (5131321651).

It can be written as a sum of positive squares in 9 ways, for example, as 321489 + 5131000161 = 567^2 + 71631^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5131321651) by changing a digit.

It is a polite number, since it can be written in 377 ways as a sum of consecutive naturals, for example, 301842442 + ... + 301842458.

Almost surely, 2^5131321650 is an apocalyptic number.

5131321650 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 5131321650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9542706471).

5131321650 is an abundant number, since it is smaller than the sum of its proper divisors (13954091292).

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

5131321650 is a wasteful number, since it uses less digits than its factorization.

5131321650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87 (or 47 counting only the distinct ones).

The product of its (nonzero) digits is 2700, while the sum is 27.

The square root of 5131321650 is about 71633.2440281745. The cubic root of 5131321650 is about 1724.8172207092.

Adding to 5131321650 its reverse (561231315), we get a palindrome (5692552965).

The spelling of 5131321650 in words is "five billion, one hundred thirty-one million, three hundred twenty-one thousand, six hundred fifty".