29172109 has 2 divisors, whose sum is σ = 29172110. Its totient is φ = 29172108.

The previous prime is 29172107. The next prime is 29172127. The reversal of 29172109 is 90127192.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15132100 + 14040009 = 3890^2 + 3747^2 .

It is a cyclic number.

It is not a de Polignac number, because 29172109 - 2¹ = 29172107 is a prime.

Together with 29172107, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (29172107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14586054 + 14586055.

It is an arithmetic number, because the mean of its divisors is an integer number (14586055).

Almost surely, 2^29172109 is an apocalyptic number.

It is an amenable number.

29172109 is a deficient number, since it is larger than the sum of its proper divisors (1).

29172109 is an equidigital number, since it uses as much as digits as its factorization.

29172109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 29172109 is about 5401.1210873299. The cubic root of 29172109 is about 307.8382696472.

The spelling of 29172109 in words is "twenty-nine million, one hundred seventy-two thousand, one hundred nine".