30172207731 has 4 divisors (see below), whose sum is σ = 40229610312. Its totient is φ = 20114805152.

The previous prime is 30172207717. The next prime is 30172207757. The reversal of 30172207731 is 13770227103.

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 30172207731 - 2²³ = 30163819123 is a prime.

It is a super-2 number, since 2×30172207731² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 30172207692 and 30172207701.

It is not an unprimeable number, because it can be changed into a prime (30172207781) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5028701286 + ... + 5028701291.

It is an arithmetic number, because the mean of its divisors is an integer number (10057402578).

Almost surely, 2^30172207731 is an apocalyptic number.

30172207731 is a deficient number, since it is larger than the sum of its proper divisors (10057402581).

30172207731 is a wasteful number, since it uses less digits than its factorization.

30172207731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10057402580.

The product of its (nonzero) digits is 12348, while the sum is 33.

The spelling of 30172207731 in words is "thirty billion, one hundred seventy-two million, two hundred seven thousand, seven hundred thirty-one".