129684953 has 2 divisors, whose sum is σ = 129684954. Its totient is φ = 129684952.

The previous prime is 129684941. The next prime is 129685007. The reversal of 129684953 is 359486921.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121176064 + 8508889 = 11008^2 + 2917^2 .

It is an emirp because it is prime and its reverse (359486921) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 129684953 - 2⁸ = 129684697 is a prime.

It is a super-2 number, since 2×129684953² = 33636374069224418, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 129684898 and 129684907.

It is not a weakly prime, because it can be changed into another prime (129684913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64842476 + 64842477.

It is an arithmetic number, because the mean of its divisors is an integer number (64842477).

Almost surely, 2^129684953 is an apocalyptic number.

It is an amenable number.

129684953 is a deficient number, since it is larger than the sum of its proper divisors (1).

129684953 is an equidigital number, since it uses as much as digits as its factorization.

129684953 is an evil number, because the sum of its binary digits is even.

The product of its digits is 466560, while the sum is 47.

The square root of 129684953 is about 11387.9301455532. The cubic root of 129684953 is about 506.1701493120.

The spelling of 129684953 in words is "one hundred twenty-nine million, six hundred eighty-four thousand, nine hundred fifty-three".