91083109 has 4 divisors (see below), whose sum is σ = 98089516. Its totient is φ = 84076704.

The previous prime is 91083107. The next prime is 91083119. The reversal of 91083109 is 90138019.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90138019 = 43 ⋅2096233.

It can be written as a sum of positive squares in 2 ways, for example, as 38564100 + 52519009 = 6210^2 + 7247^2 .

It is a cyclic number.

It is not a de Polignac number, because 91083109 - 2¹ = 91083107 is a prime.

It is a super-2 number, since 2×91083109² = 16592265490211762, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91083101) 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, 3503184 + ... + 3503209.

It is an arithmetic number, because the mean of its divisors is an integer number (24522379).

Almost surely, 2^91083109 is an apocalyptic number.

It is an amenable number.

91083109 is a deficient number, since it is larger than the sum of its proper divisors (7006407).

91083109 is a wasteful number, since it uses less digits than its factorization.

91083109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7006406.

The product of its (nonzero) digits is 1944, while the sum is 31.

The square root of 91083109 is about 9543.7471152582. The cubic root of 91083109 is about 449.9310330521.

The spelling of 91083109 in words is "ninety-one million, eighty-three thousand, one hundred nine".