129012250 has 16 divisors (see below), whose sum is σ = 241511400. Its totient is φ = 51604800.

The previous prime is 129012241. The next prime is 129012251. The reversal of 129012250 is 52210921.

It can be written as a sum of positive squares in 4 ways, for example, as 8254129 + 120758121 = 2873^2 + 10989^2 .

It is not an unprimeable number, because it can be changed into a prime (129012251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 257775 + ... + 258274.

Almost surely, 2^129012250 is an apocalyptic number.

129012250 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

129012250 is a deficient number, since it is larger than the sum of its proper divisors (112499150).

129012250 is an equidigital number, since it uses as much as digits as its factorization.

129012250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516066 (or 516056 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 22.

The square root of 129012250 is about 11358.3559549787. The cubic root of 129012250 is about 505.2934281386.

It can be divided in two parts, 12901 and 2250, that added together give a palindrome (15151).

The spelling of 129012250 in words is "one hundred twenty-nine million, twelve thousand, two hundred fifty".