87091 has 8 divisors (see below), whose sum is σ = 95040. Its totient is φ = 79488.

The previous prime is 87083. The next prime is 87103. The reversal of 87091 is 19078.

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

It is a cyclic number.

It is not a de Polignac number, because 87091 - 2³ = 87083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87011) 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, 745 + ... + 853.

It is an arithmetic number, because the mean of its divisors is an integer number (11880).

2⁸⁷⁰⁹¹ is an apocalyptic number.

87091 is a deficient number, since it is larger than the sum of its proper divisors (7949).

87091 is a wasteful number, since it uses less digits than its factorization.

87091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173.

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

The square root of 87091 is about 295.1118432052. Note that the first 3 decimals coincide. The cubic root of 87091 is about 44.3259200800.

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

The spelling of 87091 in words is "eighty-seven thousand, ninety-one".