129988658981 has 2 divisors, whose sum is σ = 129988658982. Its totient is φ = 129988658980.

The previous prime is 129988658941. The next prime is 129988659029. The reversal of 129988658981 is 189856889921.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 125861752900 + 4126906081 = 354770^2 + 64241^2 .

It is an emirp because it is prime and its reverse (189856889921) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129988658981 is a prime.

It is a super-2 number, since 2×129988658981² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 129988658899 and 129988658908.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129988658941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64994329490 + 64994329491.

It is an arithmetic number, because the mean of its divisors is an integer number (64994329491).

Almost surely, 2^129988658981 is an apocalyptic number.

It is an amenable number.

129988658981 is a deficient number, since it is larger than the sum of its proper divisors (1).

129988658981 is an equidigital number, since it uses as much as digits as its factorization.

129988658981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 179159040, while the sum is 74.

The spelling of 129988658981 in words is "one hundred twenty-nine billion, nine hundred eighty-eight million, six hundred fifty-eight thousand, nine hundred eighty-one".