91329638417 has 2 divisors, whose sum is σ = 91329638418. Its totient is φ = 91329638416.

The previous prime is 91329638369. The next prime is 91329638423. The reversal of 91329638417 is 71483692319.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 67006428736 + 24323209681 = 258856^2 + 155959^2 .

It is a cyclic number.

It is not a de Polignac number, because 91329638417 - 2⁸ = 91329638161 is a prime.

It is a super-2 number, since 2×91329638417² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (91329638447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45664819208 + 45664819209.

It is an arithmetic number, because the mean of its divisors is an integer number (45664819209).

Almost surely, 2^91329638417 is an apocalyptic number.

It is an amenable number.

91329638417 is a deficient number, since it is larger than the sum of its proper divisors (1).

91329638417 is an equidigital number, since it uses as much as digits as its factorization.

91329638417 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1959552, while the sum is 53.

The spelling of 91329638417 in words is "ninety-one billion, three hundred twenty-nine million, six hundred thirty-eight thousand, four hundred seventeen".