29081639 has 4 divisors (see below), whose sum is σ = 29097024. Its totient is φ = 29066256.

The previous prime is 29081629. The next prime is 29081681. The reversal of 29081639 is 93618092.

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 29081639 - 2⁸ = 29081383 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 (29081629) 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 in 3 ways as a sum of consecutive naturals, for example, 4382 + ... + 8795.

It is an arithmetic number, because the mean of its divisors is an integer number (7274256).

Almost surely, 2^29081639 is an apocalyptic number.

29081639 is a deficient number, since it is larger than the sum of its proper divisors (15385).

29081639 is a wasteful number, since it uses less digits than its factorization.

29081639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15384.

The product of its (nonzero) digits is 23328, while the sum is 38.

The square root of 29081639 is about 5392.7394708070. The cubic root of 29081639 is about 307.5197123107.

The spelling of 29081639 in words is "twenty-nine million, eighty-one thousand, six hundred thirty-nine".