129338981 has 2 divisors, whose sum is σ = 129338982. Its totient is φ = 129338980.

The previous prime is 129338933. The next prime is 129338987. The reversal of 129338981 is 189833921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 115906756 + 13432225 = 10766^2 + 3665^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129338981 is a prime.

It is a super-2 number, since 2×129338981² = 33457144012236722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129338987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64669490 + 64669491.

It is an arithmetic number, because the mean of its divisors is an integer number (64669491).

Almost surely, 2^129338981 is an apocalyptic number.

It is an amenable number.

129338981 is a deficient number, since it is larger than the sum of its proper divisors (1).

129338981 is an equidigital number, since it uses as much as digits as its factorization.

129338981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 44.

The square root of 129338981 is about 11372.7297075065. The cubic root of 129338981 is about 505.7196301773.

The spelling of 129338981 in words is "one hundred twenty-nine million, three hundred thirty-eight thousand, nine hundred eighty-one".