30139681349 has 4 divisors (see below), whose sum is σ = 30708354636. Its totient is φ = 29571008064.

The previous prime is 30139681343. The next prime is 30139681373. The reversal of 30139681349 is 94318693103.

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 11192158849 + 18947522500 = 105793^2 + 137650^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-30139681349 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 (30139681343) 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, 284336564 + ... + 284336669.

It is an arithmetic number, because the mean of its divisors is an integer number (7677088659).

Almost surely, 2^30139681349 is an apocalyptic number.

It is an amenable number.

30139681349 is a deficient number, since it is larger than the sum of its proper divisors (568673287).

30139681349 is an equidigital number, since it uses as much as digits as its factorization.

30139681349 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 568673286.

The product of its (nonzero) digits is 419904, while the sum is 47.

The spelling of 30139681349 in words is "thirty billion, one hundred thirty-nine million, six hundred eighty-one thousand, three hundred forty-nine".