29128791917 has 2 divisors, whose sum is σ = 29128791918. Its totient is φ = 29128791916.

The previous prime is 29128791911. The next prime is 29128791941. The reversal of 29128791917 is 71919782192.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 27732573961 + 1396217956 = 166531^2 + 37366^2 .

It is a cyclic number.

It is not a de Polignac number, because 29128791917 - 2²² = 29124597613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (29128791911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14564395958 + 14564395959.

It is an arithmetic number, because the mean of its divisors is an integer number (14564395959).

Almost surely, 2^29128791917 is an apocalyptic number.

It is an amenable number.

29128791917 is a deficient number, since it is larger than the sum of its proper divisors (1).

29128791917 is an equidigital number, since it uses as much as digits as its factorization.

29128791917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1143072, while the sum is 56.

The spelling of 29128791917 in words is "twenty-nine billion, one hundred twenty-eight million, seven hundred ninety-one thousand, nine hundred seventeen".