29439121813 has 2 divisors, whose sum is σ = 29439121814. Its totient is φ = 29439121812.

The previous prime is 29439121787. The next prime is 29439121819. The reversal of 29439121813 is 31812193492.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18806831044 + 10632290769 = 137138^2 + 103113^2 .

It is a cyclic number.

It is not a de Polignac number, because 29439121813 - 2⁵ = 29439121781 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 29439121813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (29439121819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14719560906 + 14719560907.

It is an arithmetic number, because the mean of its divisors is an integer number (14719560907).

Almost surely, 2^29439121813 is an apocalyptic number.

It is an amenable number.

29439121813 is a deficient number, since it is larger than the sum of its proper divisors (1).

29439121813 is an equidigital number, since it uses as much as digits as its factorization.

29439121813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 43.

The spelling of 29439121813 in words is "twenty-nine billion, four hundred thirty-nine million, one hundred twenty-one thousand, eight hundred thirteen".