91004205457 has 4 divisors (see below), whose sum is σ = 99277315056. Its totient is φ = 82731095860.

The previous prime is 91004205449. The next prime is 91004205521. The reversal of 91004205457 is 75450240019.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 91004205457 - 2³ = 91004205449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91004205157) 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 in 3 ways as a sum of consecutive naturals, for example, 4136554783 + ... + 4136554804.

It is an arithmetic number, because the mean of its divisors is an integer number (24819328764).

Almost surely, 2^91004205457 is an apocalyptic number.

It is an amenable number.

91004205457 is a deficient number, since it is larger than the sum of its proper divisors (8273109599).

91004205457 is a wasteful number, since it uses less digits than its factorization.

91004205457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8273109598.

The product of its (nonzero) digits is 50400, while the sum is 37.

The spelling of 91004205457 in words is "ninety-one billion, four million, two hundred five thousand, four hundred fifty-seven".