91453091998321 has 9 divisors (see below), whose sum is σ = 92839086668811. Its totient is φ = 90087489310632.

The previous prime is 91453091998271. The next prime is 91453091998363. The reversal of 91453091998321 is 12389919035419.

The square root of 91453091998321 is 9563111.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 7066160150625 + 84386931847696 = 2658225^2 + 9186236^2 .

It is not a de Polignac number, because 91453091998321 - 2³⁷ = 91315653044849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91453091978321) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 640657071 + ... + 640799803.

Almost surely, 2^{91453091998321} is an apocalyptic number.

91453091998321 is the 9563111-st square number.

91453091998321 is the 4781556-th centered octagonal number.

It is an amenable number.

91453091998321 is a deficient number, since it is larger than the sum of its proper divisors (1385994670490).

91453091998321 is an frugal number, since it uses more digits than its factorization.

91453091998321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285600 (or 142800 counting only the distinct ones).

The product of its (nonzero) digits is 18895680, while the sum is 64.

The spelling of 91453091998321 in words is "ninety-one trillion, four hundred fifty-three billion, ninety-one million, nine hundred ninety-eight thousand, three hundred twenty-one".