91478971 has 8 divisors (see below), whose sum is σ = 92323584. Its totient is φ = 90637800.

The previous prime is 91478953. The next prime is 91478983. The reversal of 91478971 is 17987419.

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

It is a cyclic number.

It is not a de Polignac number, because 91478971 - 2¹⁷ = 91347899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91478951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 102690 + ... + 103576.

It is an arithmetic number, because the mean of its divisors is an integer number (11540448).

Almost surely, 2^91478971 is an apocalyptic number.

91478971 is a deficient number, since it is larger than the sum of its proper divisors (844613).

91478971 is a wasteful number, since it uses less digits than its factorization.

91478971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1721.

The product of its digits is 127008, while the sum is 46.

The square root of 91478971 is about 9564.4639682525. The cubic root of 91478971 is about 450.5819154870.

The spelling of 91478971 in words is "ninety-one million, four hundred seventy-eight thousand, nine hundred seventy-one".