129766981 has 2 divisors, whose sum is σ = 129766982. Its totient is φ = 129766980.

The previous prime is 129766969. The next prime is 129766997. The reversal of 129766981 is 189667921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 129754881 + 12100 = 11391^2 + 110^2 .

It is a cyclic number.

It is not a de Polignac number, because 129766981 - 2¹¹ = 129764933 is a prime.

It is a super-2 number, since 2×129766981² = 33678938715708722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129766951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64883490 + 64883491.

It is an arithmetic number, because the mean of its divisors is an integer number (64883491).

Almost surely, 2^129766981 is an apocalyptic number.

It is an amenable number.

129766981 is a deficient number, since it is larger than the sum of its proper divisors (1).

129766981 is an equidigital number, since it uses as much as digits as its factorization.

129766981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 326592, while the sum is 49.

The square root of 129766981 is about 11391.5311086789. The cubic root of 129766981 is about 506.2768473086.

The spelling of 129766981 in words is "one hundred twenty-nine million, seven hundred sixty-six thousand, nine hundred eighty-one".