129428933 has 2 divisors, whose sum is σ = 129428934. Its totient is φ = 129428932.

The previous prime is 129428899. The next prime is 129428951. The reversal of 129428933 is 339824921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 122257249 + 7171684 = 11057^2 + 2678^2 .

It is an emirp because it is prime and its reverse (339824921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129428933 - 2¹⁸ = 129166789 is a prime.

It is a super-3 number, since 3×129428933³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (129428963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64714466 + 64714467.

It is an arithmetic number, because the mean of its divisors is an integer number (64714467).

Almost surely, 2^129428933 is an apocalyptic number.

It is an amenable number.

129428933 is a deficient number, since it is larger than the sum of its proper divisors (1).

129428933 is an equidigital number, since it uses as much as digits as its factorization.

129428933 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 41.

The square root of 129428933 is about 11376.6837435168. The cubic root of 129428933 is about 505.8368414261.

The spelling of 129428933 in words is "one hundred twenty-nine million, four hundred twenty-eight thousand, nine hundred thirty-three".