129846581 has 2 divisors, whose sum is σ = 129846582. Its totient is φ = 129846580.

The previous prime is 129846559. The next prime is 129846583. The reversal of 129846581 is 185648921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123965956 + 5880625 = 11134^2 + 2425^2 .

It is an emirp because it is prime and its reverse (185648921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129846581 - 2⁶ = 129846517 is a prime.

It is a super-2 number, since 2×129846581² = 33720269194779122, which contains 22 as substring.

Together with 129846583, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129846583) 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, 64923290 + 64923291.

It is an arithmetic number, because the mean of its divisors is an integer number (64923291).

Almost surely, 2^129846581 is an apocalyptic number.

It is an amenable number.

129846581 is a deficient number, since it is larger than the sum of its proper divisors (1).

129846581 is an equidigital number, since it uses as much as digits as its factorization.

129846581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 138240, while the sum is 44.

The square root of 129846581 is about 11395.0243966391. The cubic root of 129846581 is about 506.3803441035.

The spelling of 129846581 in words is "one hundred twenty-nine million, eight hundred forty-six thousand, five hundred eighty-one".