91538906 has 8 divisors (see below), whose sum is σ = 142043220. Its totient is φ = 44191168.

The previous prime is 91538899. The next prime is 91538917. The reversal of 91538906 is 60983519.

It can be written as a sum of positive squares in 2 ways, for example, as 84732025 + 6806881 = 9205^2 + 2609^2 .

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

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, 789071 + ... + 789186.

Almost surely, 2^91538906 is an apocalyptic number.

91538906 is a deficient number, since it is larger than the sum of its proper divisors (50504314).

91538906 is a wasteful number, since it uses less digits than its factorization.

91538906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1578288.

The product of its (nonzero) digits is 58320, while the sum is 41.

The square root of 91538906 is about 9567.5966679203. The cubic root of 91538906 is about 450.6802977750.

The spelling of 91538906 in words is "ninety-one million, five hundred thirty-eight thousand, nine hundred six".