129492145 has 32 divisors (see below), whose sum is σ = 171188640. Its totient is φ = 93634560.

The previous prime is 129492133. The next prime is 129492151. The reversal of 129492145 is 541294921.

It can be written as a sum of positive squares in 16 ways, for example, as 19158129 + 110334016 = 4377^2 + 10504^2 .

It is not a de Polignac number, because 129492145 - 2⁵ = 129492113 is a prime.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 254151 + ... + 254659.

It is an arithmetic number, because the mean of its divisors is an integer number (5349645).

Almost surely, 2^129492145 is an apocalyptic number.

It is an amenable number.

129492145 is a deficient number, since it is larger than the sum of its proper divisors (41696495).

129492145 is a wasteful number, since it uses less digits than its factorization.

129492145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645.

The product of its digits is 25920, while the sum is 37.

The square root of 129492145 is about 11379.4615426214. The cubic root of 129492145 is about 505.9191768402.

It can be divided in two parts, 1294 and 92145, that added together give a palindrome (93439).

The spelling of 129492145 in words is "one hundred twenty-nine million, four hundred ninety-two thousand, one hundred forty-five".