91354447598437 has 2 divisors, whose sum is σ = 91354447598438. Its totient is φ = 91354447598436.

The previous prime is 91354447598389. The next prime is 91354447598483. The reversal of 91354447598437 is 73489574445319.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89746993833121 + 1607453765316 = 9473489^2 + 1267854^2 .

It is an emirp because it is prime and its reverse (73489574445319) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91354447598437 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91354447598437.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91354447598237) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45677223799218 + 45677223799219.

It is an arithmetic number, because the mean of its divisors is an integer number (45677223799219).

Almost surely, 2^{91354447598437} is an apocalyptic number.

It is an amenable number.

91354447598437 is a deficient number, since it is larger than the sum of its proper divisors (1).

91354447598437 is an equidigital number, since it uses as much as digits as its factorization.

91354447598437 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1828915200, while the sum is 73.

The spelling of 91354447598437 in words is "ninety-one trillion, three hundred fifty-four billion, four hundred forty-seven million, five hundred ninety-eight thousand, four hundred thirty-seven".