91234454197 has 2 divisors, whose sum is σ = 91234454198. Its totient is φ = 91234454196.

The previous prime is 91234454159. The next prime is 91234454209. The reversal of 91234454197 is 79145443219.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90448156516 + 786297681 = 300746^2 + 28041^2 .

It is a cyclic number.

It is not a de Polignac number, because 91234454197 - 2¹⁹ = 91233929909 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 91234454197.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (91234455197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45617227098 + 45617227099.

It is an arithmetic number, because the mean of its divisors is an integer number (45617227099).

Almost surely, 2^91234454197 is an apocalyptic number.

It is an amenable number.

91234454197 is a deficient number, since it is larger than the sum of its proper divisors (1).

91234454197 is an equidigital number, since it uses as much as digits as its factorization.

91234454197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1088640, while the sum is 49.

The spelling of 91234454197 in words is "ninety-one billion, two hundred thirty-four million, four hundred fifty-four thousand, one hundred ninety-seven".