91813672801 has 4 divisors (see below), whose sum is σ = 92214606100. Its totient is φ = 91412739504.

The previous prime is 91813672787. The next prime is 91813672831. The reversal of 91813672801 is 10827631819.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 79487344225 + 12326328576 = 281935^2 + 111024^2 .

It is a cyclic number.

It is not a de Polignac number, because 91813672801 - 2³³ = 83223738209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91813672831) 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, 200466306 + ... + 200466763.

It is an arithmetic number, because the mean of its divisors is an integer number (23053651525).

Almost surely, 2^91813672801 is an apocalyptic number.

It is an amenable number.

91813672801 is a deficient number, since it is larger than the sum of its proper divisors (400933299).

91813672801 is a wasteful number, since it uses less digits than its factorization.

91813672801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400933298.

The product of its (nonzero) digits is 145152, while the sum is 46.

The spelling of 91813672801 in words is "ninety-one billion, eight hundred thirteen million, six hundred seventy-two thousand, eight hundred one".