91281071 has 12 divisors (see below), whose sum is σ = 107928360. Its totient is φ = 76955760.

The previous prime is 91281053. The next prime is 91281077. The reversal of 91281071 is 17018219.

It is a de Polignac number, because none of the positive numbers 2^k-91281071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91281077) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12281 + ... + 18258.

It is an arithmetic number, because the mean of its divisors is an integer number (8994030).

Almost surely, 2^91281071 is an apocalyptic number.

91281071 is a deficient number, since it is larger than the sum of its proper divisors (16647289).

91281071 is a wasteful number, since it uses less digits than its factorization.

91281071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30614 (or 30607 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 29.

The square root of 91281071 is about 9554.1127793218. The cubic root of 91281071 is about 450.2567604659.

The spelling of 91281071 in words is "ninety-one million, two hundred eighty-one thousand, seventy-one".