29691143 has 4 divisors (see below), whose sum is σ = 29712648. Its totient is φ = 29669640.

The previous prime is 29691139. The next prime is 29691187. The reversal of 29691143 is 34119692.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 29691143 - 2² = 29691139 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29691133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8528 + ... + 11493.

It is an arithmetic number, because the mean of its divisors is an integer number (7428162).

Almost surely, 2^29691143 is an apocalyptic number.

29691143 is a deficient number, since it is larger than the sum of its proper divisors (21505).

29691143 is a wasteful number, since it uses less digits than its factorization.

29691143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21504.

The product of its digits is 11664, while the sum is 35.

The square root of 29691143 is about 5448.9579737781. The cubic root of 29691143 is about 309.6532473844.

The spelling of 29691143 in words is "twenty-nine million, six hundred ninety-one thousand, one hundred forty-three".