129126091 has 2 divisors, whose sum is σ = 129126092. Its totient is φ = 129126090.

The previous prime is 129126089. The next prime is 129126103. The reversal of 129126091 is 190621921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 129126091 - 2¹ = 129126089 is a prime.

Together with 129126089, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (129126791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64563045 + 64563046.

It is an arithmetic number, because the mean of its divisors is an integer number (64563046).

Almost surely, 2^129126091 is an apocalyptic number.

129126091 is a deficient number, since it is larger than the sum of its proper divisors (1).

129126091 is an equidigital number, since it uses as much as digits as its factorization.

129126091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 129126091 is about 11363.3661826063. The cubic root of 129126091 is about 505.4420088558.

The spelling of 129126091 in words is "one hundred twenty-nine million, one hundred twenty-six thousand, ninety-one".