91103621093 has 2 divisors, whose sum is σ = 91103621094. Its totient is φ = 91103621092.

The previous prime is 91103621051. The next prime is 91103621131. The reversal of 91103621093 is 39012630119.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62599039204 + 28504581889 = 250198^2 + 168833^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91103621093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91103621293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45551810546 + 45551810547.

It is an arithmetic number, because the mean of its divisors is an integer number (45551810547).

Almost surely, 2^91103621093 is an apocalyptic number.

It is an amenable number.

91103621093 is a deficient number, since it is larger than the sum of its proper divisors (1).

91103621093 is an equidigital number, since it uses as much as digits as its factorization.

91103621093 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8748, while the sum is 35.

The spelling of 91103621093 in words is "ninety-one billion, one hundred three million, six hundred twenty-one thousand, ninety-three".