129493109 has 2 divisors, whose sum is σ = 129493110. Its totient is φ = 129493108.

The previous prime is 129493079. The next prime is 129493121. The reversal of 129493109 is 901394921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 129458884 + 34225 = 11378^2 + 185^2 .

It is a cyclic number.

It is not a de Polignac number, because 129493109 - 2¹² = 129489013 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129493409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64746554 + 64746555.

It is an arithmetic number, because the mean of its divisors is an integer number (64746555).

Almost surely, 2^129493109 is an apocalyptic number.

It is an amenable number.

129493109 is a deficient number, since it is larger than the sum of its proper divisors (1).

129493109 is an equidigital number, since it uses as much as digits as its factorization.

129493109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17496, while the sum is 38.

The square root of 129493109 is about 11379.5038995556. The cubic root of 129493109 is about 505.9204322700.

The spelling of 129493109 in words is "one hundred twenty-nine million, four hundred ninety-three thousand, one hundred nine".