91396321 has 8 divisors (see below), whose sum is σ = 92480904. Its totient is φ = 90316800.

The previous prime is 91396307. The next prime is 91396351. The reversal of 91396321 is 12369319.

It can be written as a sum of positive squares in 4 ways, for example, as 29160000 + 62236321 = 5400^2 + 7889^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91396321 - 2¹⁷ = 91265249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91396351) 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 7 ways as a sum of consecutive naturals, for example, 44305 + ... + 46321.

It is an arithmetic number, because the mean of its divisors is an integer number (11560113).

Almost surely, 2^91396321 is an apocalyptic number.

It is an amenable number.

91396321 is a deficient number, since it is larger than the sum of its proper divisors (1084583).

91396321 is a wasteful number, since it uses less digits than its factorization.

91396321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2531.

The product of its digits is 8748, while the sum is 34.

The square root of 91396321 is about 9560.1423106563. The cubic root of 91396321 is about 450.4461763985.

The spelling of 91396321 in words is "ninety-one million, three hundred ninety-six thousand, three hundred twenty-one".