291321645339 has 16 divisors (see below), whose sum is σ = 406149391872. Its totient is φ = 185388844608.

The previous prime is 291321645157. The next prime is 291321645347. The reversal of 291321645339 is 933546123192.

It is not a de Polignac number, because 291321645339 - 2¹⁶ = 291321579803 is a prime.

It is not an unprimeable number, because it can be changed into a prime (291321645359) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4301154 + ... + 4368359.

It is an arithmetic number, because the mean of its divisors is an integer number (25384336992).

Almost surely, 2^291321645339 is an apocalyptic number.

291321645339 is a deficient number, since it is larger than the sum of its proper divisors (114827746533).

291321645339 is a wasteful number, since it uses less digits than its factorization.

291321645339 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8670026.

The product of its digits is 1049760, while the sum is 48.

The spelling of 291321645339 in words is "two hundred ninety-one billion, three hundred twenty-one million, six hundred forty-five thousand, three hundred thirty-nine".