91382438506 has 8 divisors (see below), whose sum is σ = 137093856804. Its totient is φ = 45684486240.

The previous prime is 91382438489. The next prime is 91382438573. The reversal of 91382438506 is 60583428319.

It can be written as a sum of positive squares in 2 ways, for example, as 83862947281 + 7519491225 = 289591^2 + 86715^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 91382438506.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3349525 + ... + 3376696.

Almost surely, 2^91382438506 is an apocalyptic number.

91382438506 is a deficient number, since it is larger than the sum of its proper divisors (45711418298).

91382438506 is a wasteful number, since it uses less digits than its factorization.

91382438506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6733016.

The product of its (nonzero) digits is 1244160, while the sum is 49.

The spelling of 91382438506 in words is "ninety-one billion, three hundred eighty-two million, four hundred thirty-eight thousand, five hundred six".