129201249 has 16 divisors (see below), whose sum is σ = 173813760. Its totient is φ = 85365840.

The previous prime is 129201217. The next prime is 129201251. The reversal of 129201249 is 942102921.

129201249 = 248² + 249² + ... + 738².

It is a happy number.

It is not a de Polignac number, because 129201249 - 2⁵ = 129201217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (129201269) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 262894 + ... + 263384.

It is an arithmetic number, because the mean of its divisors is an integer number (10863360).

Almost surely, 2^129201249 is an apocalyptic number.

It is an amenable number.

129201249 is a deficient number, since it is larger than the sum of its proper divisors (44612511).

129201249 is a wasteful number, since it uses less digits than its factorization.

129201249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1100.

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 129201249 is about 11366.6727321587. The cubic root of 129201249 is about 505.5400542166.

The spelling of 129201249 in words is "one hundred twenty-nine million, two hundred one thousand, two hundred forty-nine".