130820621 has 2 divisors, whose sum is σ = 130820622. Its totient is φ = 130820620.

The previous prime is 130820587. The next prime is 130820629. The reversal of 130820621 is 126028031.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 119355625 + 11464996 = 10925^2 + 3386^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-130820621 is a prime.

It is a super-2 number, since 2×130820621² = 34228069757651282, which contains 22 as substring.

It is a Chen prime.

It is equal to p_7422035 and since 130820621 and 7422035 have the same sum of digits, it is a Honaker prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (130820629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65410310 + 65410311.

It is an arithmetic number, because the mean of its divisors is an integer number (65410311).

Almost surely, 2^130820621 is an apocalyptic number.

It is an amenable number.

130820621 is a deficient number, since it is larger than the sum of its proper divisors (1).

130820621 is an equidigital number, since it uses as much as digits as its factorization.

130820621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 130820621 is about 11437.6842498821. The cubic root of 130820621 is about 507.6433898012.

Adding to 130820621 its reverse (126028031), we get a palindrome (256848652).

The spelling of 130820621 in words is "one hundred thirty million, eight hundred twenty thousand, six hundred twenty-one".