91471897 has 8 divisors (see below), whose sum is σ = 104126400. Its totient is φ = 79540560.

The previous prime is 91471859. The next prime is 91471901. The reversal of 91471897 is 79817419.

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

It is not a de Polignac number, because 91471897 - 2⁷ = 91471769 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91471837) 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, 180522 + ... + 181027.

It is an arithmetic number, because the mean of its divisors is an integer number (13015800).

Almost surely, 2^91471897 is an apocalyptic number.

It is an amenable number.

91471897 is a deficient number, since it is larger than the sum of its proper divisors (12654503).

91471897 is a wasteful number, since it uses less digits than its factorization.

91471897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 361583.

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

The square root of 91471897 is about 9564.0941547017. The cubic root of 91471897 is about 450.5703008008.

The spelling of 91471897 in words is "ninety-one million, four hundred seventy-one thousand, eight hundred ninety-seven".