129696530 has 32 divisors (see below), whose sum is σ = 240997680. Its totient is φ = 50222080.

The previous prime is 129696509. The next prime is 129696533. The reversal of 129696530 is 35696921.

It can be written as a sum of positive squares in 8 ways, for example, as 48678529 + 81018001 = 6977^2 + 9001^2 .

It is a Harshad number since it is a multiple of its sum of digits (41).

It is not an unprimeable number, because it can be changed into a prime (129696533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55016 + ... + 57324.

Almost surely, 2^129696530 is an apocalyptic number.

129696530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129696530 is a deficient number, since it is larger than the sum of its proper divisors (111301150).

129696530 is a wasteful number, since it uses less digits than its factorization.

129696530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2494.

The product of its (nonzero) digits is 87480, while the sum is 41.

The square root of 129696530 is about 11388.4384355363. The cubic root of 129696530 is about 506.1852108318.

The spelling of 129696530 in words is "one hundred twenty-nine million, six hundred ninety-six thousand, five hundred thirty".