321691117 has 4 divisors (see below), whose sum is σ = 350935776. Its totient is φ = 292446460.

The previous prime is 321691093. The next prime is 321691121. The reversal of 321691117 is 711196123.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 321691117 - 2¹⁹ = 321166829 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 (321691157) 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, 14622313 + ... + 14622334.

It is an arithmetic number, because the mean of its divisors is an integer number (87733944).

Almost surely, 2^321691117 is an apocalyptic number.

It is an amenable number.

321691117 is a deficient number, since it is larger than the sum of its proper divisors (29244659).

321691117 is a wasteful number, since it uses less digits than its factorization.

321691117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29244658.

The product of its digits is 2268, while the sum is 31.

The square root of 321691117 is about 17935.7496916075. The cubic root of 321691117 is about 685.1931662594.

The spelling of 321691117 in words is "three hundred twenty-one million, six hundred ninety-one thousand, one hundred seventeen".