91871485 has 8 divisors (see below), whose sum is σ = 116730936. Its totient is φ = 69173760.

The previous prime is 91871473. The next prime is 91871489. The reversal of 91871485 is 58417819.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1279161 + 90592324 = 1131^2 + 9518^2 .

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

It is not a de Polignac number, because 91871485 - 2⁹ = 91870973 is a prime.

It is a super-2 number, since 2×91871485² = 16880739512210450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91871489) 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, 540336 + ... + 540505.

It is an arithmetic number, because the mean of its divisors is an integer number (14591367).

Almost surely, 2^91871485 is an apocalyptic number.

It is an amenable number.

91871485 is a deficient number, since it is larger than the sum of its proper divisors (24859451).

91871485 is a wasteful number, since it uses less digits than its factorization.

91871485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1080863.

The product of its digits is 80640, while the sum is 43.

The square root of 91871485 is about 9584.9613979400. The cubic root of 91871485 is about 451.2254417361.

The spelling of 91871485 in words is "ninety-one million, eight hundred seventy-one thousand, four hundred eighty-five".