129573991 has 2 divisors, whose sum is σ = 129573992. Its totient is φ = 129573990.

The previous prime is 129573989. The next prime is 129574009. The reversal of 129573991 is 199375921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 129573991 - 2¹ = 129573989 is a prime.

Together with 129573989, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129573911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64786995 + 64786996.

It is an arithmetic number, because the mean of its divisors is an integer number (64786996).

Almost surely, 2^129573991 is an apocalyptic number.

129573991 is the 6085-th centered heptagonal number.

129573991 is a deficient number, since it is larger than the sum of its proper divisors (1).

129573991 is an equidigital number, since it uses as much as digits as its factorization.

129573991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 153090, while the sum is 46.

The square root of 129573991 is about 11383.0571904036. The cubic root of 129573991 is about 506.0257437677.

The spelling of 129573991 in words is "one hundred twenty-nine million, five hundred seventy-three thousand, nine hundred ninety-one".