91111950001 has 4 divisors (see below), whose sum is σ = 92656220400. Its totient is φ = 89567679604.

The previous prime is 91111949993. The next prime is 91111950011. The reversal of 91111950001 is 10005911119.

It is a happy number.

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 not a de Polignac number, because 91111950001 - 2³ = 91111949993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91111950011) 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, 772135111 + ... + 772135228.

It is an arithmetic number, because the mean of its divisors is an integer number (23164055100).

Almost surely, 2^91111950001 is an apocalyptic number.

It is an amenable number.

91111950001 is a deficient number, since it is larger than the sum of its proper divisors (1544270399).

91111950001 is a wasteful number, since it uses less digits than its factorization.

91111950001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1544270398.

The product of its (nonzero) digits is 405, while the sum is 28.

The spelling of 91111950001 in words is "ninety-one billion, one hundred eleven million, nine hundred fifty thousand, one".