130917821 has 2 divisors, whose sum is σ = 130917822. Its totient is φ = 130917820.

The previous prime is 130917811. The next prime is 130917859. The reversal of 130917821 is 128719031.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 72012196 + 58905625 = 8486^2 + 7675^2 .

It is a cyclic number.

It is not a de Polignac number, because 130917821 - 2²² = 126723517 is a prime.

It is equal to p_7427291 and since 130917821 and 7427291 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 (130917811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65458910 + 65458911.

It is an arithmetic number, because the mean of its divisors is an integer number (65458911).

Almost surely, 2^130917821 is an apocalyptic number.

It is an amenable number.

130917821 is a deficient number, since it is larger than the sum of its proper divisors (1).

130917821 is an equidigital number, since it uses as much as digits as its factorization.

130917821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3024, while the sum is 32.

The square root of 130917821 is about 11441.9325727781. The cubic root of 130917821 is about 507.7690853822.

The spelling of 130917821 in words is "one hundred thirty million, nine hundred seventeen thousand, eight hundred twenty-one".