91673405 has 4 divisors (see below), whose sum is σ = 110008092. Its totient is φ = 73338720.

The previous prime is 91673369. The next prime is 91673431. The reversal of 91673405 is 50437619.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50437619 = 71 ⋅710389.

It can be written as a sum of positive squares in 2 ways, for example, as 11874916 + 79798489 = 3446^2 + 8933^2 .

It is not a de Polignac number, because 91673405 - 2⁶ = 91673341 is a prime.

It is a Duffinian number.

It is a Curzon number.

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 3 ways as a sum of consecutive naturals, for example, 9167336 + ... + 9167345.

It is an arithmetic number, because the mean of its divisors is an integer number (27502023).

Almost surely, 2^91673405 is an apocalyptic number.

It is an amenable number.

91673405 is a deficient number, since it is larger than the sum of its proper divisors (18334687).

91673405 is a wasteful number, since it uses less digits than its factorization.

91673405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18334686.

The product of its (nonzero) digits is 22680, while the sum is 35.

The square root of 91673405 is about 9574.6229690782. The cubic root of 91673405 is about 450.9009193967.

The spelling of 91673405 in words is "ninety-one million, six hundred seventy-three thousand, four hundred five".