91428573 has 4 divisors (see below), whose sum is σ = 121904768. Its totient is φ = 60952380.

The previous prime is 91428541. The next prime is 91428581. The reversal of 91428573 is 37582419.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 91428573 - 2⁵ = 91428541 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91427573) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15238093 + ... + 15238098.

It is an arithmetic number, because the mean of its divisors is an integer number (30476192).

Almost surely, 2^91428573 is an apocalyptic number.

It is an amenable number.

91428573 is a deficient number, since it is larger than the sum of its proper divisors (30476195).

91428573 is a wasteful number, since it uses less digits than its factorization.

91428573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30476194.

The product of its digits is 60480, while the sum is 39.

The square root of 91428573 is about 9561.8289568471. The cubic root of 91428573 is about 450.4991547584.

The spelling of 91428573 in words is "ninety-one million, four hundred twenty-eight thousand, five hundred seventy-three".