30725717231 has 4 divisors (see below), whose sum is σ = 33518964264. Its totient is φ = 27932470200.

The previous prime is 30725717219. The next prime is 30725717233. The reversal of 30725717231 is 13271752703.

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

It is a cyclic number.

It is not a de Polignac number, because 30725717231 - 2¹⁴ = 30725700847 is a prime.

It is a super-2 number, since 2×30725717231² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30725717233) 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, 1396623500 + ... + 1396623521.

It is an arithmetic number, because the mean of its divisors is an integer number (8379741066).

Almost surely, 2^30725717231 is an apocalyptic number.

30725717231 is a deficient number, since it is larger than the sum of its proper divisors (2793247033).

30725717231 is a wasteful number, since it uses less digits than its factorization.

30725717231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2793247032.

The product of its (nonzero) digits is 61740, while the sum is 38.

The spelling of 30725717231 in words is "thirty billion, seven hundred twenty-five million, seven hundred seventeen thousand, two hundred thirty-one".