129356545 has 4 divisors (see below), whose sum is σ = 155227860. Its totient is φ = 103485232.

The previous prime is 129356543. The next prime is 129356561. The reversal of 129356545 is 545653921.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18601969 + 110754576 = 4313^2 + 10524^2 .

It is a cyclic number.

It is not a de Polignac number, because 129356545 - 2¹ = 129356543 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 129356498 and 129356507.

It is not an unprimeable number, because it can be changed into a prime (129356543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12935650 + ... + 12935659.

It is an arithmetic number, because the mean of its divisors is an integer number (38806965).

Almost surely, 2^129356545 is an apocalyptic number.

It is an amenable number.

129356545 is a deficient number, since it is larger than the sum of its proper divisors (25871315).

129356545 is an equidigital number, since it uses as much as digits as its factorization.

129356545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25871314.

The product of its digits is 162000, while the sum is 40.

The square root of 129356545 is about 11373.5018793686. The cubic root of 129356545 is about 505.7425210786.

The spelling of 129356545 in words is "one hundred twenty-nine million, three hundred fifty-six thousand, five hundred forty-five".