129830681 has 2 divisors, whose sum is σ = 129830682. Its totient is φ = 129830680.

The previous prime is 129830677. The next prime is 129830689. The reversal of 129830681 is 186038921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129595456 + 235225 = 11384^2 + 485^2 .

It is an emirp because it is prime and its reverse (186038921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129830681 - 2² = 129830677 is a prime.

It is a super-2 number, since 2×129830681² = 33712011457847522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (129830689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64915340 + 64915341.

It is an arithmetic number, because the mean of its divisors is an integer number (64915341).

Almost surely, 2^129830681 is an apocalyptic number.

It is an amenable number.

129830681 is a deficient number, since it is larger than the sum of its proper divisors (1).

129830681 is an equidigital number, since it uses as much as digits as its factorization.

129830681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 129830681 is about 11394.3267023550. The cubic root of 129830681 is about 506.3596741300.

The spelling of 129830681 in words is "one hundred twenty-nine million, eight hundred thirty thousand, six hundred eighty-one".