91121879210 has 16 divisors (see below), whose sum is σ = 167833787616. Its totient is φ = 35601106128.

The previous prime is 91121879209. The next prime is 91121879213. The reversal of 91121879210 is 1297812119.

It is not an unprimeable number, because it can be changed into a prime (91121879213) 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 7 ways as a sum of consecutive naturals, for example, 105955244 + ... + 105956103.

It is an arithmetic number, because the mean of its divisors is an integer number (10489611726).

Almost surely, 2^91121879210 is an apocalyptic number.

91121879210 is a deficient number, since it is larger than the sum of its proper divisors (76711908406).

91121879210 is a wasteful number, since it uses less digits than its factorization.

91121879210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211911397.

The product of its (nonzero) digits is 18144, while the sum is 41.

The spelling of 91121879210 in words is "ninety-one billion, one hundred twenty-one million, eight hundred seventy-nine thousand, two hundred ten".