130781721 has 8 divisors (see below), whose sum is σ = 199286464. Its totient is φ = 74732400.

The previous prime is 130781719. The next prime is 130781753. The reversal of 130781721 is 127187031.

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

It is not a de Polignac number, because 130781721 - 2¹ = 130781719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (130781771) 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, 3113830 + ... + 3113871.

It is an arithmetic number, because the mean of its divisors is an integer number (24910808).

Almost surely, 2^130781721 is an apocalyptic number.

It is an amenable number.

130781721 is a deficient number, since it is larger than the sum of its proper divisors (68504743).

130781721 is an equidigital number, since it uses as much as digits as its factorization.

130781721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6227711.

The product of its (nonzero) digits is 2352, while the sum is 30.

The square root of 130781721 is about 11435.9836043954. The cubic root of 130781721 is about 507.5930682608.

It can be divided in two parts, 1307 and 81721, that added together give a triangular number (83028 = T₄₀₇).

The spelling of 130781721 in words is "one hundred thirty million, seven hundred eighty-one thousand, seven hundred twenty-one".