91238405 has 8 divisors (see below), whose sum is σ = 115926552. Its totient is φ = 68697088.

The previous prime is 91238359. The next prime is 91238449. The reversal of 91238405 is 50483219.

It can be written as a sum of positive squares in 4 ways, for example, as 9498724 + 81739681 = 3082^2 + 9041^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 91238405 - 2¹⁰ = 91237381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 536612 + ... + 536781.

It is an arithmetic number, because the mean of its divisors is an integer number (14490819).

Almost surely, 2^91238405 is an apocalyptic number.

It is an amenable number.

91238405 is a deficient number, since it is larger than the sum of its proper divisors (24688147).

91238405 is a wasteful number, since it uses less digits than its factorization.

91238405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1073415.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 91238405 is about 9551.8796579521. The cubic root of 91238405 is about 450.1865975117.

The spelling of 91238405 in words is "ninety-one million, two hundred thirty-eight thousand, four hundred five".