91439045 has 16 divisors (see below), whose sum is σ = 113082480. Its totient is φ = 70946304.

The previous prime is 91439009. The next prime is 91439063. The reversal of 91439045 is 54093419.

It can be written as a sum of positive squares in 8 ways, for example, as 5635876 + 85803169 = 2374^2 + 9263^2 .

It is a cyclic number.

It is not a de Polignac number, because 91439045 - 2¹⁰ = 91438021 is a prime.

It is a super-2 number, since 2×91439045² = 16722197901024050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 91438996 and 91439014.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21647 + ... + 25523.

It is an arithmetic number, because the mean of its divisors is an integer number (7067655).

Almost surely, 2^91439045 is an apocalyptic number.

It is an amenable number.

91439045 is a deficient number, since it is larger than the sum of its proper divisors (21643435).

91439045 is a wasteful number, since it uses less digits than its factorization.

91439045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4024.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 91439045 is about 9562.3765351507. The cubic root of 91439045 is about 450.5163537838.

The spelling of 91439045 in words is "ninety-one million, four hundred thirty-nine thousand, forty-five".