91324885745 has 4 divisors (see below), whose sum is σ = 109589862900. Its totient is φ = 73059908592.

The previous prime is 91324885741. The next prime is 91324885763. The reversal of 91324885745 is 54758842319.

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 64354049761 + 26970835984 = 253681^2 + 164228^2 .

It is a cyclic number.

It is not a de Polignac number, because 91324885745 - 2² = 91324885741 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91324885741) 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, 9132488570 + ... + 9132488579.

It is an arithmetic number, because the mean of its divisors is an integer number (27397465725).

Almost surely, 2^91324885745 is an apocalyptic number.

It is an amenable number.

91324885745 is a deficient number, since it is larger than the sum of its proper divisors (18264977155).

91324885745 is a wasteful number, since it uses less digits than its factorization.

91324885745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18264977154.

The product of its digits is 9676800, while the sum is 56.

The spelling of 91324885745 in words is "ninety-one billion, three hundred twenty-four million, eight hundred eighty-five thousand, seven hundred forty-five".