91547048321 has 4 divisors (see below), whose sum is σ = 94500178944. Its totient is φ = 88593917700.

The previous prime is 91547048297. The next prime is 91547048339. The reversal of 91547048321 is 12384074519.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12384074519 = 43 ⋅288001733.

It is a cyclic number.

It is not a de Polignac number, because 91547048321 - 2²⁶ = 91479939457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91547048221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1476565265 + ... + 1476565326.

It is an arithmetic number, because the mean of its divisors is an integer number (23625044736).

Almost surely, 2^91547048321 is an apocalyptic number.

It is an amenable number.

91547048321 is a deficient number, since it is larger than the sum of its proper divisors (2953130623).

91547048321 is a wasteful number, since it uses less digits than its factorization.

91547048321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2953130622.

The product of its (nonzero) digits is 241920, while the sum is 44.

The spelling of 91547048321 in words is "ninety-one billion, five hundred forty-seven million, forty-eight thousand, three hundred twenty-one".