91400321 has 4 divisors (see below), whose sum is σ = 95374272. Its totient is φ = 87426372.

The previous prime is 91400311. The next prime is 91400329. The reversal of 91400321 is 12300419.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12300419 = 271 ⋅45389.

It is a cyclic number.

It is not a de Polignac number, because 91400321 - 2¹⁴ = 91383937 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91400293 and 91400302.

It is not an unprimeable number, because it can be changed into a prime (91400329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1986941 + ... + 1986986.

It is an arithmetic number, because the mean of its divisors is an integer number (23843568).

Almost surely, 2^91400321 is an apocalyptic number.

It is an amenable number.

91400321 is a deficient number, since it is larger than the sum of its proper divisors (3973951).

91400321 is a wasteful number, since it uses less digits than its factorization.

91400321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3973950.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 91400321 is about 9560.3515102741. The cubic root of 91400321 is about 450.4527476274.

The spelling of 91400321 in words is "ninety-one million, four hundred thousand, three hundred twenty-one".