87105691 has 8 divisors (see below), whose sum is σ = 90030464. Its totient is φ = 84188160.

The previous prime is 87105661. The next prime is 87105703. The reversal of 87105691 is 19650178.

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 87105691 - 2⁷ = 87105563 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 87105691.

It is not an unprimeable number, because it can be changed into a prime (87105611) 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 7 ways as a sum of consecutive naturals, for example, 34525 + ... + 36961.

It is an arithmetic number, because the mean of its divisors is an integer number (11253808).

Almost surely, 2^87105691 is an apocalyptic number.

87105691 is a deficient number, since it is larger than the sum of its proper divisors (2924773).

87105691 is a wasteful number, since it uses less digits than its factorization.

87105691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3621.

The product of its (nonzero) digits is 15120, while the sum is 37.

The square root of 87105691 is about 9333.0429657213. The cubic root of 87105691 is about 443.2841232180.

The spelling of 87105691 in words is "eighty-seven million, one hundred five thousand, six hundred ninety-one".