29139531 has 4 divisors (see below), whose sum is σ = 38852712. Its totient is φ = 19426352.

The previous prime is 29139511. The next prime is 29139541. The reversal of 29139531 is 13593192.

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 29139531 - 2²² = 24945227 is a prime.

It is a super-2 number, since 2×29139531² = 1698224533799922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 29139492 and 29139501.

It is not an unprimeable number, because it can be changed into a prime (29139511) 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, 4856586 + ... + 4856591.

It is an arithmetic number, because the mean of its divisors is an integer number (9713178).

Almost surely, 2^29139531 is an apocalyptic number.

29139531 is a deficient number, since it is larger than the sum of its proper divisors (9713181).

29139531 is an equidigital number, since it uses as much as digits as its factorization.

29139531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9713180.

The product of its digits is 7290, while the sum is 33.

The square root of 29139531 is about 5398.1043895056. The cubic root of 29139531 is about 307.7236340012.

The spelling of 29139531 in words is "twenty-nine million, one hundred thirty-nine thousand, five hundred thirty-one".