130971721 has 2 divisors, whose sum is σ = 130971722. Its totient is φ = 130971720.

The previous prime is 130971713. The next prime is 130971733. The reversal of 130971721 is 127179031.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126810121 + 4161600 = 11261^2 + 2040^2 .

It is a cyclic number.

It is not a de Polignac number, because 130971721 - 2³ = 130971713 is a prime.

It is not a weakly prime, because it can be changed into another prime (130971521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65485860 + 65485861.

It is an arithmetic number, because the mean of its divisors is an integer number (65485861).

Almost surely, 2^130971721 is an apocalyptic number.

It is an amenable number.

130971721 is a deficient number, since it is larger than the sum of its proper divisors (1).

130971721 is an equidigital number, since it uses as much as digits as its factorization.

130971721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2646, while the sum is 31.

The square root of 130971721 is about 11444.2877017314. The cubic root of 130971721 is about 507.8387601303.

The spelling of 130971721 in words is "one hundred thirty million, nine hundred seventy-one thousand, seven hundred twenty-one".