91538398 has 8 divisors (see below), whose sum is σ = 156922992. Its totient is φ = 39230736.

The previous prime is 91538389. The next prime is 91538401. The reversal of 91538398 is 89383519.

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

It is a congruent number.

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, 3269215 + ... + 3269242.

It is an arithmetic number, because the mean of its divisors is an integer number (19615374).

Almost surely, 2^91538398 is an apocalyptic number.

91538398 is a deficient number, since it is larger than the sum of its proper divisors (65384594).

91538398 is a wasteful number, since it uses less digits than its factorization.

91538398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6538466.

The product of its digits is 233280, while the sum is 46.

The square root of 91538398 is about 9567.5701199416. The cubic root of 91538398 is about 450.6794640821.

The spelling of 91538398 in words is "ninety-one million, five hundred thirty-eight thousand, three hundred ninety-eight".