91668471 has 32 divisors (see below), whose sum is σ = 133539840. Its totient is φ = 55712256.

The previous prime is 91668469. The next prime is 91668517. The reversal of 91668471 is 17486619.

It is not a de Polignac number, because 91668471 - 2¹ = 91668469 is a prime.

It is a super-3 number, since 3×91668471³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91668431) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 400185 + ... + 400413.

It is an arithmetic number, because the mean of its divisors is an integer number (4173120).

Almost surely, 2^91668471 is an apocalyptic number.

91668471 is a deficient number, since it is larger than the sum of its proper divisors (41871369).

91668471 is a wasteful number, since it uses less digits than its factorization.

91668471 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 463.

The product of its digits is 72576, while the sum is 42.

The square root of 91668471 is about 9574.3653053349. The cubic root of 91668471 is about 450.8928298639.

The spelling of 91668471 in words is "ninety-one million, six hundred sixty-eight thousand, four hundred seventy-one".