91928093 has 4 divisors (see below), whose sum is σ = 92771580. Its totient is φ = 91084608.

The previous prime is 91928069. The next prime is 91928101. The reversal of 91928093 is 39082919.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 39082919 = 3347 ⋅11677.

It can be written as a sum of positive squares in 2 ways, for example, as 76772644 + 15155449 = 8762^2 + 3893^2 .

It is a cyclic number.

It is not a de Polignac number, because 91928093 - 2¹⁶ = 91862557 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91928093.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91928003) 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, 421580 + ... + 421797.

It is an arithmetic number, because the mean of its divisors is an integer number (23192895).

Almost surely, 2^91928093 is an apocalyptic number.

It is an amenable number.

91928093 is a deficient number, since it is larger than the sum of its proper divisors (843487).

91928093 is a wasteful number, since it uses less digits than its factorization.

91928093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 843486.

The product of its (nonzero) digits is 34992, while the sum is 41.

The square root of 91928093 is about 9587.9139024086. The cubic root of 91928093 is about 451.3180991600.

The spelling of 91928093 in words is "ninety-one million, nine hundred twenty-eight thousand, ninety-three".