130821979 has 2 divisors, whose sum is σ = 130821980. Its totient is φ = 130821978.

The previous prime is 130821959. The next prime is 130821983. The reversal of 130821979 is 979128031.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-130821979 is a prime.

It is a super-2 number, since 2×130821979² = 34228780378952882, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (130821949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65410989 + 65410990.

It is an arithmetic number, because the mean of its divisors is an integer number (65410990).

Almost surely, 2^130821979 is an apocalyptic number.

130821979 is a deficient number, since it is larger than the sum of its proper divisors (1).

130821979 is an equidigital number, since it uses as much as digits as its factorization.

130821979 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27216, while the sum is 40.

The square root of 130821979 is about 11437.7436148919. The cubic root of 130821979 is about 507.6451463473.

The spelling of 130821979 in words is "one hundred thirty million, eight hundred twenty-one thousand, nine hundred seventy-nine".