29172711805 has 4 divisors (see below), whose sum is σ = 35007254172. Its totient is φ = 23338169440.

The previous prime is 29172711787. The next prime is 29172711809. The reversal of 29172711805 is 50811727192.

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 16743583609 + 12429128196 = 129397^2 + 111486^2 .

It is not a de Polignac number, because 29172711805 - 2⁷ = 29172711677 is a prime.

It is a super-2 number, since 2×29172711805² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29172711809) 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, 2917271176 + ... + 2917271185.

It is an arithmetic number, because the mean of its divisors is an integer number (8751813543).

Almost surely, 2^29172711805 is an apocalyptic number.

It is an amenable number.

29172711805 is a deficient number, since it is larger than the sum of its proper divisors (5834542367).

29172711805 is an equidigital number, since it uses as much as digits as its factorization.

29172711805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5834542366.

The product of its (nonzero) digits is 70560, while the sum is 43.

The spelling of 29172711805 in words is "twenty-nine billion, one hundred seventy-two million, seven hundred eleven thousand, eight hundred five".