129672545 has 16 divisors (see below), whose sum is σ = 159960528. Its totient is φ = 100853760.

The previous prime is 129672533. The next prime is 129672553. The reversal of 129672545 is 545276921.

It can be written as a sum of positive squares in 8 ways, for example, as 20511841 + 109160704 = 4529^2 + 10448^2 .

It is not a de Polignac number, because 129672545 - 2⁸ = 129672289 is a prime.

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

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68147 + ... + 70023.

It is an arithmetic number, because the mean of its divisors is an integer number (9997533).

Almost surely, 2^129672545 is an apocalyptic number.

It is an amenable number.

129672545 is a deficient number, since it is larger than the sum of its proper divisors (30287983).

129672545 is a wasteful number, since it uses less digits than its factorization.

129672545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2260.

The product of its digits is 151200, while the sum is 41.

The square root of 129672545 is about 11387.3853451967. The cubic root of 129672545 is about 506.1540056773.

The spelling of 129672545 in words is "one hundred twenty-nine million, six hundred seventy-two thousand, five hundred forty-five".