91304787745 has 8 divisors (see below), whose sum is σ = 109646257320. Its totient is φ = 72990155520.

The previous prime is 91304787709. The next prime is 91304787757. The reversal of 91304787745 is 54778740319.

It can be written as a sum of positive squares in 4 ways, for example, as 18024673536 + 73280114209 = 134256^2 + 270703^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 91304787745 - 2³¹ = 89157304097 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6701850 + ... + 6715459.

It is an arithmetic number, because the mean of its divisors is an integer number (13705782165).

Almost surely, 2^91304787745 is an apocalyptic number.

It is an amenable number.

91304787745 is a deficient number, since it is larger than the sum of its proper divisors (18341469575).

91304787745 is a wasteful number, since it uses less digits than its factorization.

91304787745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13418675.

The product of its (nonzero) digits is 5927040, while the sum is 55.

The spelling of 91304787745 in words is "ninety-one billion, three hundred four million, seven hundred eighty-seven thousand, seven hundred forty-five".