90542013605 has 16 divisors (see below), whose sum is σ = 110610782064. Its totient is φ = 71130554880.

The previous prime is 90542013599. The next prime is 90542013619. The reversal of 90542013605 is 50631024509.

It is a Cunningham number, because it is equal to 300902²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 41704991524 + 48837022081 = 204218^2 + 220991^2 .

It is a de Polignac number, because none of the positive numbers 2^k-90542013605 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52382 + ... + 428751.

It is an arithmetic number, because the mean of its divisors is an integer number (6913173879).

Almost surely, 2^90542013605 is an apocalyptic number.

It is an amenable number.

90542013605 is a deficient number, since it is larger than the sum of its proper divisors (20068768459).

90542013605 is a wasteful number, since it uses less digits than its factorization.

90542013605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 481816.

The product of its (nonzero) digits is 32400, while the sum is 35.

The spelling of 90542013605 in words is "ninety billion, five hundred forty-two million, thirteen thousand, six hundred five".