129030591 has 4 divisors (see below), whose sum is σ = 172040792. Its totient is φ = 86020392.

The previous prime is 129030571. The next prime is 129030593. The reversal of 129030591 is 195030921.

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

It is not a de Polignac number, because 129030591 - 2¹⁰ = 129029567 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129030593) 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, 21505096 + ... + 21505101.

It is an arithmetic number, because the mean of its divisors is an integer number (43010198).

Almost surely, 2^129030591 is an apocalyptic number.

129030591 is a deficient number, since it is larger than the sum of its proper divisors (43010201).

129030591 is an equidigital number, since it uses as much as digits as its factorization.

129030591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43010200.

The product of its (nonzero) digits is 2430, while the sum is 30.

The square root of 129030591 is about 11359.1633054552. The cubic root of 129030591 is about 505.3173719827.

The spelling of 129030591 in words is "one hundred twenty-nine million, thirty thousand, five hundred ninety-one".