91071471 has 8 divisors (see below), whose sum is σ = 121475200. Its totient is φ = 60691032.

The previous prime is 91071469. The next prime is 91071481. The reversal of 91071471 is 17417019.

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

It is not a de Polignac number, because 91071471 - 2¹ = 91071469 is a prime.

It is a super-3 number, since 3×91071471³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91071451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7980 + ... + 15678.

It is an arithmetic number, because the mean of its divisors is an integer number (15184400).

Almost surely, 2^91071471 is an apocalyptic number.

91071471 is a deficient number, since it is larger than the sum of its proper divisors (30403729).

91071471 is a wasteful number, since it uses less digits than its factorization.

91071471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11645.

The product of its (nonzero) digits is 1764, while the sum is 30.

The square root of 91071471 is about 9543.1373771941. The cubic root of 91071471 is about 449.9118691608.

The spelling of 91071471 in words is "ninety-one million, seventy-one thousand, four hundred seventy-one".