29138831 has 4 divisors (see below), whose sum is σ = 29184792. Its totient is φ = 29092872.

The previous prime is 29138807. The next prime is 29138839. The reversal of 29138831 is 13883192.

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 29138831 - 2¹⁴ = 29122447 is a prime.

It is a super-2 number, since 2×29138831² = 1698142944093122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 29138791 and 29138800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29138839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22016 + ... + 23301.

It is an arithmetic number, because the mean of its divisors is an integer number (7296198).

Almost surely, 2^29138831 is an apocalyptic number.

29138831 is a deficient number, since it is larger than the sum of its proper divisors (45961).

29138831 is an equidigital number, since it uses as much as digits as its factorization.

29138831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45960.

The product of its digits is 10368, while the sum is 35.

The square root of 29138831 is about 5398.0395515409. The cubic root of 29138831 is about 307.7211698999.

The spelling of 29138831 in words is "twenty-nine million, one hundred thirty-eight thousand, eight hundred thirty-one".