385172908129 has 3 divisors (see below), whose sum is σ = 385173528753. Its totient is φ = 385172287506.

The previous prime is 385172908121. The next prime is 385172908139. The reversal of 385172908129 is 921809271583.

It is a happy number.

The square root of 385172908129 is 620623.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 385172908129 - 2³ = 385172908121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 385172908129.

It is not an unprimeable number, because it can be changed into a prime (385172908121) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 310312 + ... + 930934.

It is an arithmetic number, because the mean of its divisors is an integer number (128391176251).

Almost surely, 2^385172908129 is an apocalyptic number.

385172908129 is the 620623-rd square number.

385172908129 is the 310312-nd centered octagonal number.

It is an amenable number.

385172908129 is a deficient number, since it is larger than the sum of its proper divisors (620624).

385172908129 is an frugal number, since it uses more digits than its factorization.

385172908129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1241246 (or 620623 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 55.

The spelling of 385172908129 in words is "three hundred eighty-five billion, one hundred seventy-two million, nine hundred eight thousand, one hundred twenty-nine".