30390131729 has 4 divisors (see below), whose sum is σ = 30399605220. Its totient is φ = 30380658240.

The previous prime is 30390131711. The next prime is 30390131749. The reversal of 30390131729 is 92713109303.

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

It can be written as a sum of positive squares in 2 ways, for example, as 13082098129 + 17308033600 = 114377^2 + 131560^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30390131729 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 30390131692 and 30390131701.

It is not an unprimeable number, because it can be changed into a prime (30390131749) 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, 4731932 + ... + 4738349.

It is an arithmetic number, because the mean of its divisors is an integer number (7599901305).

Almost surely, 2^30390131729 is an apocalyptic number.

It is an amenable number.

30390131729 is a deficient number, since it is larger than the sum of its proper divisors (9473491).

30390131729 is an equidigital number, since it uses as much as digits as its factorization.

30390131729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9473490.

The product of its (nonzero) digits is 30618, while the sum is 38.

The spelling of 30390131729 in words is "thirty billion, three hundred ninety million, one hundred thirty-one thousand, seven hundred twenty-nine".