129148781 has 2 divisors, whose sum is σ = 129148782. Its totient is φ = 129148780.

The previous prime is 129148763. The next prime is 129148793. The reversal of 129148781 is 187841921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105781225 + 23367556 = 10285^2 + 4834^2 .

It is a cyclic number.

It is not a de Polignac number, because 129148781 - 2²² = 124954477 is a prime.

It is a super-2 number, since 2×129148781² = 33358815267571922, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129148741) 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, 64574390 + 64574391.

It is an arithmetic number, because the mean of its divisors is an integer number (64574391).

Almost surely, 2^129148781 is an apocalyptic number.

It is an amenable number.

129148781 is a deficient number, since it is larger than the sum of its proper divisors (1).

129148781 is an equidigital number, since it uses as much as digits as its factorization.

129148781 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 32256, while the sum is 41.

The square root of 129148781 is about 11364.3645224887. The cubic root of 129148781 is about 505.4716124972.

The spelling of 129148781 in words is "one hundred twenty-nine million, one hundred forty-eight thousand, seven hundred eighty-one".