129523101 has 4 divisors (see below), whose sum is σ = 172697472. Its totient is φ = 86348732.

The previous prime is 129523073. The next prime is 129523129. The reversal of 129523101 is 101325921.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 101325921 = 3 ⋅33775307.

It is an interprime number because it is at equal distance from previous prime (129523073) and next prime (129523129).

It is a cyclic number.

It is not a de Polignac number, because 129523101 - 2¹⁹ = 128998813 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129523601) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 21587181 + ... + 21587186.

It is an arithmetic number, because the mean of its divisors is an integer number (43174368).

Almost surely, 2^129523101 is an apocalyptic number.

It is an amenable number.

129523101 is a deficient number, since it is larger than the sum of its proper divisors (43174371).

129523101 is an equidigital number, since it uses as much as digits as its factorization.

129523101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43174370.

The product of its (nonzero) digits is 540, while the sum is 24.

The square root of 129523101 is about 11380.8216311477. The cubic root of 129523101 is about 505.9594881302.

The spelling of 129523101 in words is "one hundred twenty-nine million, five hundred twenty-three thousand, one hundred one".