91854971 has 4 divisors (see below), whose sum is σ = 98920752. Its totient is φ = 84789192.

The previous prime is 91854947. The next prime is 91855003. The reversal of 91854971 is 17945819.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17945819 = 23 ⋅780253.

It is a cyclic number.

It is not a de Polignac number, because 91854971 - 2¹⁸ = 91592827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91854941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3532871 + ... + 3532896.

It is an arithmetic number, because the mean of its divisors is an integer number (24730188).

Almost surely, 2^91854971 is an apocalyptic number.

91854971 is a deficient number, since it is larger than the sum of its proper divisors (7065781).

91854971 is a wasteful number, since it uses less digits than its factorization.

91854971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7065780.

The product of its digits is 90720, while the sum is 44.

The square root of 91854971 is about 9584.0999055728. The cubic root of 91854971 is about 451.1984040270.

The spelling of 91854971 in words is "ninety-one million, eight hundred fifty-four thousand, nine hundred seventy-one".