91487071 has 16 divisors (see below), whose sum is σ = 104358240. Its totient is φ = 79505280.

The previous prime is 91487059. The next prime is 91487087. The reversal of 91487071 is 17078419.

It is a cyclic number.

It is not a de Polignac number, because 91487071 - 2⁷ = 91486943 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91487071.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91487021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41661 + ... + 43801.

It is an arithmetic number, because the mean of its divisors is an integer number (6522390).

Almost surely, 2^91487071 is an apocalyptic number.

91487071 is a deficient number, since it is larger than the sum of its proper divisors (12871169).

91487071 is a wasteful number, since it uses less digits than its factorization.

91487071 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2346.

The product of its (nonzero) digits is 14112, while the sum is 37.

The square root of 91487071 is about 9564.8874013237. The cubic root of 91487071 is about 450.5952140107.

The spelling of 91487071 in words is "ninety-one million, four hundred eighty-seven thousand, seventy-one".