90401067521 has 4 divisors (see below), whose sum is σ = 90423734100. Its totient is φ = 90378400944.

The previous prime is 90401067503. The next prime is 90401067529. The reversal of 90401067521 is 12576010409.

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 74032423921 + 16368643600 = 272089^2 + 127940^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90401067521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90401067529) 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, 11327306 + ... + 11335283.

It is an arithmetic number, because the mean of its divisors is an integer number (22605933525).

Almost surely, 2^90401067521 is an apocalyptic number.

It is an amenable number.

90401067521 is a deficient number, since it is larger than the sum of its proper divisors (22666579).

90401067521 is a wasteful number, since it uses less digits than its factorization.

90401067521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22666578.

The product of its (nonzero) digits is 15120, while the sum is 35.

The spelling of 90401067521 in words is "ninety billion, four hundred one million, sixty-seven thousand, five hundred twenty-one".