129438577 has 4 divisors (see below), whose sum is σ = 131077120. Its totient is φ = 127800036.

The previous prime is 129438553. The next prime is 129438581. The reversal of 129438577 is 775834921.

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: 775834921 = 1289 ⋅601889.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-129438577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (129435577) 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, 819153 + ... + 819310.

It is an arithmetic number, because the mean of its divisors is an integer number (32769280).

Almost surely, 2^129438577 is an apocalyptic number.

It is an amenable number.

129438577 is a deficient number, since it is larger than the sum of its proper divisors (1638543).

129438577 is an equidigital number, since it uses as much as digits as its factorization.

129438577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1638542.

The product of its digits is 423360, while the sum is 46.

The square root of 129438577 is about 11377.1075849708. The cubic root of 129438577 is about 505.8494047410.

The spelling of 129438577 in words is "one hundred twenty-nine million, four hundred thirty-eight thousand, five hundred seventy-seven".