130721605 has 8 divisors (see below), whose sum is σ = 179275392. Its totient is φ = 89637648.

The previous prime is 130721603. The next prime is 130721641. The reversal of 130721605 is 506127031.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 130721605 - 2¹ = 130721603 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 130721605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (130721603) 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, 1867417 + ... + 1867486.

It is an arithmetic number, because the mean of its divisors is an integer number (22409424).

Almost surely, 2^130721605 is an apocalyptic number.

It is an amenable number.

130721605 is a deficient number, since it is larger than the sum of its proper divisors (48553787).

130721605 is an equidigital number, since it uses as much as digits as its factorization.

130721605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3734915.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 130721605 is about 11433.3549319524. The cubic root of 130721605 is about 507.5152818002.

Adding to 130721605 its reverse (506127031), we get a palindrome (636848636).

The spelling of 130721605 in words is "one hundred thirty million, seven hundred twenty-one thousand, six hundred five".