91428091 has 8 divisors (see below), whose sum is σ = 97123104. Its totient is φ = 85768320.

The previous prime is 91428089. The next prime is 91428101. The reversal of 91428091 is 19082419.

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 91428091 - 2¹ = 91428089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91428011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3360 + ... + 13933.

It is an arithmetic number, because the mean of its divisors is an integer number (12140388).

Almost surely, 2^91428091 is an apocalyptic number.

91428091 is a deficient number, since it is larger than the sum of its proper divisors (5695013).

91428091 is a wasteful number, since it uses less digits than its factorization.

91428091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17621.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 91428091 is about 9561.8037524308. The cubic root of 91428091 is about 450.4983630986.

The spelling of 91428091 in words is "ninety-one million, four hundred twenty-eight thousand, ninety-one".