91180000993 has 2 divisors, whose sum is σ = 91180000994. Its totient is φ = 91180000992.

The previous prime is 91180000969. The next prime is 91180001021. The reversal of 91180000993 is 39900008119.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 90088821904 + 1091179089 = 300148^2 + 33033^2 .

It is a cyclic number.

It is not a de Polignac number, because 91180000993 - 2²¹ = 91177903841 is a prime.

It is a super-3 number, since 3×91180000993³ (a number of 34 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (91180007993) 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 as a sum of consecutive naturals, namely, 45590000496 + 45590000497.

It is an arithmetic number, because the mean of its divisors is an integer number (45590000497).

Almost surely, 2^91180000993 is an apocalyptic number.

It is an amenable number.

91180000993 is a deficient number, since it is larger than the sum of its proper divisors (1).

91180000993 is an equidigital number, since it uses as much as digits as its factorization.

91180000993 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17496, while the sum is 40.

The spelling of 91180000993 in words is "ninety-one billion, one hundred eighty million, nine hundred ninety-three", and thus it is an aban number.