87198731211 has 4 divisors (see below), whose sum is σ = 116264974952. Its totient is φ = 58132487472.

The previous prime is 87198731201. The next prime is 87198731237. The reversal of 87198731211 is 11213789178.

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

It is not a de Polignac number, because 87198731211 - 2¹⁰ = 87198730187 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87198731201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14533121866 + ... + 14533121871.

It is an arithmetic number, because the mean of its divisors is an integer number (29066243738).

Almost surely, 2^87198731211 is an apocalyptic number.

87198731211 is a deficient number, since it is larger than the sum of its proper divisors (29066243741).

87198731211 is a wasteful number, since it uses less digits than its factorization.

87198731211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29066243740.

The product of its digits is 169344, while the sum is 48.

The spelling of 87198731211 in words is "eighty-seven billion, one hundred ninety-eight million, seven hundred thirty-one thousand, two hundred eleven".