87112191 has 4 divisors (see below), whose sum is σ = 116149592. Its totient is φ = 58074792.

The previous prime is 87112187. The next prime is 87112217. The reversal of 87112191 is 19121178.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 87112191 - 2² = 87112187 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87112121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14518696 + ... + 14518701.

It is an arithmetic number, because the mean of its divisors is an integer number (29037398).

Almost surely, 2^87112191 is an apocalyptic number.

87112191 is a deficient number, since it is larger than the sum of its proper divisors (29037401).

87112191 is a wasteful number, since it uses less digits than its factorization.

87112191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29037400.

The product of its digits is 1008, while the sum is 30.

The square root of 87112191 is about 9333.3911843445. The cubic root of 87112191 is about 443.2951491915.

The spelling of 87112191 in words is "eighty-seven million, one hundred twelve thousand, one hundred ninety-one".