91424108177813 has 2 divisors, whose sum is σ = 91424108177814. Its totient is φ = 91424108177812.

The previous prime is 91424108177771. The next prime is 91424108177839. The reversal of 91424108177813 is 31877180142419.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90460966143409 + 963142034404 = 9511097^2 + 981398^2 .

It is a cyclic number.

It is not a de Polignac number, because 91424108177813 - 2⁸ = 91424108177557 is a prime.

It is a super-2 number, since 2×91424108177813² (a number of 29 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91424108177113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45712054088906 + 45712054088907.

It is an arithmetic number, because the mean of its divisors is an integer number (45712054088907).

Almost surely, 2^{91424108177813} is an apocalyptic number.

It is an amenable number.

91424108177813 is a deficient number, since it is larger than the sum of its proper divisors (1).

91424108177813 is an equidigital number, since it uses as much as digits as its factorization.

91424108177813 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2709504, while the sum is 56.

The spelling of 91424108177813 in words is "ninety-one trillion, four hundred twenty-four billion, one hundred eight million, one hundred seventy-seven thousand, eight hundred thirteen".