129188893 has 2 divisors, whose sum is σ = 129188894. Its totient is φ = 129188892.

The previous prime is 129188887. The next prime is 129188897. The reversal of 129188893 is 398881921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 105637284 + 23551609 = 10278^2 + 4853^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129188893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129188897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64594446 + 64594447.

It is an arithmetic number, because the mean of its divisors is an integer number (64594447).

Almost surely, 2^129188893 is an apocalyptic number.

It is an amenable number.

129188893 is a deficient number, since it is larger than the sum of its proper divisors (1).

129188893 is an equidigital number, since it uses as much as digits as its factorization.

129188893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 248832, while the sum is 49.

The square root of 129188893 is about 11366.1292003918. The cubic root of 129188893 is about 505.5239381391.

The spelling of 129188893 in words is "one hundred twenty-nine million, one hundred eighty-eight thousand, eight hundred ninety-three".