91745895387 has 6 divisors (see below), whose sum is σ = 122328560028. Its totient is φ = 61163580504.

The previous prime is 91745895377. The next prime is 91745895389. The reversal of 91745895387 is 78359854719.

It is a happy number.

It is not a de Polignac number, because 91745895387 - 2¹⁰ = 91745894363 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91745895389) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 437193 + ... + 612069.

It is an arithmetic number, because the mean of its divisors is an integer number (20388093338).

Almost surely, 2^91745895387 is an apocalyptic number.

91745895387 is a deficient number, since it is larger than the sum of its proper divisors (30582664641).

91745895387 is an frugal number, since it uses more digits than its factorization.

91745895387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349757 (or 174880 counting only the distinct ones).

The product of its digits is 76204800, while the sum is 66.

The spelling of 91745895387 in words is "ninety-one billion, seven hundred forty-five million, eight hundred ninety-five thousand, three hundred eighty-seven".