29781938449 has 2 divisors, whose sum is σ = 29781938450. Its totient is φ = 29781938448.

The previous prime is 29781938441. The next prime is 29781938467. The reversal of 29781938449 is 94483918792.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20615216400 + 9166722049 = 143580^2 + 95743^2 .

It is a cyclic number.

It is not a de Polignac number, because 29781938449 - 2³ = 29781938441 is a prime.

It is not a weakly prime, because it can be changed into another prime (29781938441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14890969224 + 14890969225.

It is an arithmetic number, because the mean of its divisors is an integer number (14890969225).

Almost surely, 2^29781938449 is an apocalyptic number.

It is an amenable number.

29781938449 is a deficient number, since it is larger than the sum of its proper divisors (1).

29781938449 is an equidigital number, since it uses as much as digits as its factorization.

29781938449 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31352832, while the sum is 64.

The spelling of 29781938449 in words is "twenty-nine billion, seven hundred eighty-one million, nine hundred thirty-eight thousand, four hundred forty-nine".