129474979 has 2 divisors, whose sum is σ = 129474980. Its totient is φ = 129474978.

The previous prime is 129474977. The next prime is 129474991. The reversal of 129474979 is 979474921.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 129474979 - 2¹ = 129474977 is a prime.

Together with 129474977, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (129474973) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64737489 + 64737490.

It is an arithmetic number, because the mean of its divisors is an integer number (64737490).

Almost surely, 2^129474979 is an apocalyptic number.

129474979 is a deficient number, since it is larger than the sum of its proper divisors (1).

129474979 is an equidigital number, since it uses as much as digits as its factorization.

129474979 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1143072, while the sum is 52.

The square root of 129474979 is about 11378.7072640085. The cubic root of 129474979 is about 505.8968202914.

The spelling of 129474979 in words is "one hundred twenty-nine million, four hundred seventy-four thousand, nine hundred seventy-nine".