91609273 has 6 divisors (see below), whose sum is σ = 106565946. Its totient is φ = 78522192.

The previous prime is 91609183. The next prime is 91609283. The reversal of 91609273 is 37290619.

It can be written as a sum of positive squares in only one way, i.e., 87459904 + 4149369 = 9352^2 + 2037^2 .

It is not a de Polignac number, because 91609273 - 2²¹ = 89512121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91609283) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 934740 + ... + 934837.

It is an arithmetic number, because the mean of its divisors is an integer number (17760991).

Almost surely, 2^91609273 is an apocalyptic number.

It is an amenable number.

91609273 is a deficient number, since it is larger than the sum of its proper divisors (14956673).

91609273 is a wasteful number, since it uses less digits than its factorization.

91609273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1869591 (or 1869584 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 37.

The square root of 91609273 is about 9571.2733217686. The cubic root of 91609273 is about 450.7957492237.

The spelling of 91609273 in words is "ninety-one million, six hundred nine thousand, two hundred seventy-three".