291139022329 has 3 divisors (see below), whose sum is σ = 291139561903. Its totient is φ = 291138482756.

The previous prime is 291139022281. The next prime is 291139022347. The reversal of 291139022329 is 923220931192.

The square root of 291139022329 is 539573.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 8485173225 + 282653849104 = 92115^2 + 531652^2 .

It is not a de Polignac number, because 291139022329 - 2¹¹ = 291139020281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (291139022429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 269787 + ... + 809359.

Almost surely, 2^291139022329 is an apocalyptic number.

291139022329 is the 539573-rd square number.

291139022329 is the 269787-th centered octagonal number.

It is an amenable number.

291139022329 is a deficient number, since it is larger than the sum of its proper divisors (539574).

291139022329 is an frugal number, since it uses more digits than its factorization.

291139022329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1079146 (or 539573 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 43.

The spelling of 291139022329 in words is "two hundred ninety-one billion, one hundred thirty-nine million, twenty-two thousand, three hundred twenty-nine".