90121373456593 has 4 divisors (see below), whose sum is σ = 90121437101620. Its totient is φ = 90121309811568.

The previous prime is 90121373456573. The next prime is 90121373456711. The reversal of 90121373456593 is 39565437312109.

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

It can be written as a sum of positive squares in 2 ways, for example, as 27952453592064 + 62168919864529 = 5287008^2 + 7884727^2 .

It is a cyclic number.

It is not a de Polignac number, because 90121373456593 - 2¹³ = 90121373448401 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90121373456573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29649030 + ... + 32547007.

It is an arithmetic number, because the mean of its divisors is an integer number (22530359275405).

Almost surely, 2^{90121373456593} is an apocalyptic number.

It is an amenable number.

90121373456593 is a deficient number, since it is larger than the sum of its proper divisors (63645027).

90121373456593 is a wasteful number, since it uses less digits than its factorization.

90121373456593 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63645026.

The product of its (nonzero) digits is 18370800, while the sum is 58.

The spelling of 90121373456593 in words is "ninety trillion, one hundred twenty-one billion, three hundred seventy-three million, four hundred fifty-six thousand, five hundred ninety-three".