87891041 has 4 divisors (see below), whose sum is σ = 100446912. Its totient is φ = 75335172.

The previous prime is 87891031. The next prime is 87891047. The reversal of 87891041 is 14019878.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87891041 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 87890986 and 87891004.

It is not an unprimeable number, because it can be changed into a prime (87891047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6277925 + ... + 6277938.

It is an arithmetic number, because the mean of its divisors is an integer number (25111728).

Almost surely, 2^87891041 is an apocalyptic number.

It is an amenable number.

87891041 is a deficient number, since it is larger than the sum of its proper divisors (12555871).

87891041 is a wasteful number, since it uses less digits than its factorization.

87891041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12555870.

The product of its (nonzero) digits is 16128, while the sum is 38.

The square root of 87891041 is about 9375.0221866404. The cubic root of 87891041 is about 444.6123645322.

It can be divided in two parts, 878 and 91041, that added together give a palindrome (91919).

The spelling of 87891041 in words is "eighty-seven million, eight hundred ninety-one thousand, forty-one".