130971521 has 2 divisors, whose sum is σ = 130971522. Its totient is φ = 130971520.

The previous prime is 130971481. The next prime is 130971539. The reversal of 130971521 is 125179031.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130530625 + 440896 = 11425^2 + 664^2 .

It is an emirp because it is prime and its reverse (125179031) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 130971521 - 2²⁶ = 63862657 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (130971721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65485760 + 65485761.

It is an arithmetic number, because the mean of its divisors is an integer number (65485761).

Almost surely, 2^130971521 is an apocalyptic number.

It is an amenable number.

130971521 is a deficient number, since it is larger than the sum of its proper divisors (1).

130971521 is an equidigital number, since it uses as much as digits as its factorization.

130971521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1890, while the sum is 29.

The square root of 130971521 is about 11444.2789637443. The cubic root of 130971521 is about 507.8385016322.

The spelling of 130971521 in words is "one hundred thirty million, nine hundred seventy-one thousand, five hundred twenty-one".