129474991 has 2 divisors, whose sum is σ = 129474992. Its totient is φ = 129474990.

The previous prime is 129474979. The next prime is 129475019. The reversal of 129474991 is 199474921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 129474991 - 2⁵ = 129474959 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129474931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64737495 + 64737496.

It is an arithmetic number, because the mean of its divisors is an integer number (64737496).

Almost surely, 2^129474991 is an apocalyptic number.

129474991 is the 6570-th hex number.

129474991 is a deficient number, since it is larger than the sum of its proper divisors (1).

129474991 is an equidigital number, since it uses as much as digits as its factorization.

129474991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 46.

The square root of 129474991 is about 11378.7077913092. The cubic root of 129474991 is about 505.8968359206.

The spelling of 129474991 in words is "one hundred twenty-nine million, four hundred seventy-four thousand, nine hundred ninety-one".