30129173 has 4 divisors (see below), whose sum is σ = 31168140. Its totient is φ = 29090208.

The previous prime is 30129157. The next prime is 30129199. The reversal of 30129173 is 37192103.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37192103 = 13 ⋅2860931.

It can be written as a sum of positive squares in 2 ways, for example, as 25472209 + 4656964 = 5047^2 + 2158^2 .

It is a cyclic number.

It is not a de Polignac number, because 30129173 - 2⁴ = 30129157 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 (30129133) 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, 519440 + ... + 519497.

It is an arithmetic number, because the mean of its divisors is an integer number (7792035).

Almost surely, 2^30129173 is an apocalyptic number.

It is an amenable number.

30129173 is a deficient number, since it is larger than the sum of its proper divisors (1038967).

30129173 is a wasteful number, since it uses less digits than its factorization.

30129173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1038966.

The product of its (nonzero) digits is 1134, while the sum is 26.

The square root of 30129173 is about 5489.0047367442. The cubic root of 30129173 is about 311.1685793168.

The spelling of 30129173 in words is "thirty million, one hundred twenty-nine thousand, one hundred seventy-three".