129064531 has 4 divisors (see below), whose sum is σ = 129124864. Its totient is φ = 129004200.

The previous prime is 129064517. The next prime is 129064571. The reversal of 129064531 is 135460921.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 135460921 = 139 ⋅974539.

It is a cyclic number.

It is not a de Polignac number, because 129064531 - 2⁵ = 129064499 is a prime.

It is a super-2 number, since 2×129064531² = 33315306324499922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 129064493 and 129064502.

It is not an unprimeable number, because it can be changed into a prime (129064571) 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, 26835 + ... + 31276.

It is an arithmetic number, because the mean of its divisors is an integer number (32281216).

Almost surely, 2^129064531 is an apocalyptic number.

129064531 is a deficient number, since it is larger than the sum of its proper divisors (60333).

129064531 is an equidigital number, since it uses as much as digits as its factorization.

129064531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60332.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 129064531 is about 11360.6571552882. The cubic root of 129064531 is about 505.3616740560.

The spelling of 129064531 in words is "one hundred twenty-nine million, sixty-four thousand, five hundred thirty-one".