91321404 has 12 divisors (see below), whose sum is σ = 213083304. Its totient is φ = 30440464.

The previous prime is 91321403. The next prime is 91321409. The reversal of 91321404 is 40412319.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91321403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3805047 + ... + 3805070.

It is an arithmetic number, because the mean of its divisors is an integer number (17756942).

Almost surely, 2^91321404 is an apocalyptic number.

It is an amenable number.

91321404 is an abundant number, since it is smaller than the sum of its proper divisors (121761900).

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

91321404 is a wasteful number, since it uses less digits than its factorization.

91321404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7610124 (or 7610122 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 91321404 is about 9556.2233125854. The cubic root of 91321404 is about 450.3230667718.

The spelling of 91321404 in words is "ninety-one million, three hundred twenty-one thousand, four hundred four".