91394573198 has 4 divisors (see below), whose sum is σ = 137091859800. Its totient is φ = 45697286598.

The previous prime is 91394573197. The next prime is 91394573233. The reversal of 91394573198 is 89137549319.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91394573197) 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, 22848643298 + ... + 22848643301.

It is an arithmetic number, because the mean of its divisors is an integer number (34272964950).

Almost surely, 2^91394573198 is an apocalyptic number.

91394573198 is a deficient number, since it is larger than the sum of its proper divisors (45697286602).

91394573198 is a wasteful number, since it uses less digits than its factorization.

91394573198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45697286601.

The product of its digits is 7348320, while the sum is 59.

The spelling of 91394573198 in words is "ninety-one billion, three hundred ninety-four million, five hundred seventy-three thousand, one hundred ninety-eight".