91321340 has 24 divisors (see below), whose sum is σ = 209209392. Its totient is φ = 33207680.

The previous prime is 91321333. The next prime is 91321357. The reversal of 91321340 is 4312319.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 207329 + ... + 207768.

It is an arithmetic number, because the mean of its divisors is an integer number (8717058).

Almost surely, 2^91321340 is an apocalyptic number.

It is an amenable number.

91321340 is an abundant number, since it is smaller than the sum of its proper divisors (117888052).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91321340 is a wasteful number, since it uses less digits than its factorization.

91321340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 415117 (or 415115 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 91321340 is about 9556.2199639816. The cubic root of 91321340 is about 450.3229615731.

Adding to 91321340 its reverse (4312319), we get a palindrome (95633659).

The spelling of 91321340 in words is "ninety-one million, three hundred twenty-one thousand, three hundred forty".