91217265101 has 4 divisors (see below), whose sum is σ = 91224576732. Its totient is φ = 91209953472.

The previous prime is 91217265077. The next prime is 91217265103. The reversal of 91217265101 is 10156271219.

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 69630015625 + 21587249476 = 263875^2 + 146926^2 .

It is a cyclic number.

It is not a de Polignac number, because 91217265101 - 2⁶ = 91217265037 is a prime.

It is a super-2 number, since 2×91217265101² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91217265103) 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, 3637070 + ... + 3662063.

It is an arithmetic number, because the mean of its divisors is an integer number (22806144183).

Almost surely, 2^91217265101 is an apocalyptic number.

It is an amenable number.

91217265101 is a deficient number, since it is larger than the sum of its proper divisors (7311631).

91217265101 is a wasteful number, since it uses less digits than its factorization.

91217265101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7311630.

The product of its (nonzero) digits is 7560, while the sum is 35.

The spelling of 91217265101 in words is "ninety-one billion, two hundred seventeen million, two hundred sixty-five thousand, one hundred one".