91870 has 8 divisors (see below), whose sum is σ = 165384. Its totient is φ = 36744.

The previous prime is 91867. The next prime is 91873. The reversal of 91870 is 7819.

It is an interprime number because it is at equal distance from previous prime (91867) and next prime (91873).

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

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4584 + ... + 4603.

It is an arithmetic number, because the mean of its divisors is an integer number (20673).

2⁹¹⁸⁷⁰ is an apocalyptic number.

91870 is a deficient number, since it is larger than the sum of its proper divisors (73514).

91870 is a wasteful number, since it uses less digits than its factorization.

91870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9194.

The product of its (nonzero) digits is 504, while the sum is 25.

The square root of 91870 is about 303.1006433513. The cubic root of 91870 is about 45.1223010538.

It can be divided in two parts, 91 and 870, that added together give a square (961 = 31²).

The spelling of 91870 in words is "ninety-one thousand, eight hundred seventy".