129593921 has 2 divisors, whose sum is σ = 129593922. Its totient is φ = 129593920.

The previous prime is 129593887. The next prime is 129593963. The reversal of 129593921 is 129395921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 75777025 + 53816896 = 8705^2 + 7336^2 .

It is a cyclic number.

It is not a de Polignac number, because 129593921 - 2¹⁴ = 129577537 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (129593521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64796960 + 64796961.

It is an arithmetic number, because the mean of its divisors is an integer number (64796961).

Almost surely, 2^129593921 is an apocalyptic number.

It is an amenable number.

129593921 is a deficient number, since it is larger than the sum of its proper divisors (1).

129593921 is an equidigital number, since it uses as much as digits as its factorization.

129593921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43740, while the sum is 41.

The square root of 129593921 is about 11383.9325806155. The cubic root of 129593921 is about 506.0516866697.

The spelling of 129593921 in words is "one hundred twenty-nine million, five hundred ninety-three thousand, nine hundred twenty-one".