129312611 has 2 divisors, whose sum is σ = 129312612. Its totient is φ = 129312610.

The previous prime is 129312587. The next prime is 129312649. The reversal of 129312611 is 116213921.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129312611 is a prime.

It is not a weakly prime, because it can be changed into another prime (129312661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64656305 + 64656306.

It is an arithmetic number, because the mean of its divisors is an integer number (64656306).

Almost surely, 2^129312611 is an apocalyptic number.

129312611 is a deficient number, since it is larger than the sum of its proper divisors (1).

129312611 is an equidigital number, since it uses as much as digits as its factorization.

129312611 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648, while the sum is 26.

The square root of 129312611 is about 11371.5702961376. The cubic root of 129312611 is about 505.6852586549.

The spelling of 129312611 in words is "one hundred twenty-nine million, three hundred twelve thousand, six hundred eleven".