130731730 has 16 divisors (see below), whose sum is σ = 241677720. Its totient is φ = 50879232.

The previous prime is 130731721. The next prime is 130731737. The reversal of 130731730 is 37137031.

It can be written as a sum of positive squares in 4 ways, for example, as 101344489 + 29387241 = 10067^2 + 5421^2 .

It is a junction number, because it is equal to n+sod(n) for n = 130731695 and 130731704.

It is not an unprimeable number, because it can be changed into a prime (130731737) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 176295 + ... + 177034.

Almost surely, 2^130731730 is an apocalyptic number.

130731730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

130731730 is a deficient number, since it is larger than the sum of its proper divisors (110945990).

130731730 is a wasteful number, since it uses less digits than its factorization.

130731730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 353373.

The product of its (nonzero) digits is 1323, while the sum is 25.

The square root of 130731730 is about 11433.7977067989. The cubic root of 130731730 is about 507.5283846064.

Adding to 130731730 its reverse (37137031), we get a palindrome (167868761).

The spelling of 130731730 in words is "one hundred thirty million, seven hundred thirty-one thousand, seven hundred thirty".