91730645 has 4 divisors (see below), whose sum is σ = 110076780. Its totient is φ = 73384512.

The previous prime is 91730633. The next prime is 91730677. The reversal of 91730645 is 54603719.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 30625156 + 61105489 = 5534^2 + 7817^2 .

It is a cyclic number.

It is not a de Polignac number, because 91730645 - 2²² = 87536341 is a prime.

It is a super-2 number, since 2×91730645² = 16829022464232050, which contains 22 as substring.

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 3 ways as a sum of consecutive naturals, for example, 9173060 + ... + 9173069.

It is an arithmetic number, because the mean of its divisors is an integer number (27519195).

Almost surely, 2^91730645 is an apocalyptic number.

It is an amenable number.

91730645 is a deficient number, since it is larger than the sum of its proper divisors (18346135).

91730645 is a wasteful number, since it uses less digits than its factorization.

91730645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18346134.

The product of its (nonzero) digits is 22680, while the sum is 35.

The square root of 91730645 is about 9577.6116542696. The cubic root of 91730645 is about 450.9947459495.

The spelling of 91730645 in words is "ninety-one million, seven hundred thirty thousand, six hundred forty-five".