90120012001 has 4 divisors (see below), whose sum is σ = 90239061652. Its totient is φ = 90000962352.

The previous prime is 90120011987. The next prime is 90120012011. The reversal of 90120012001 is 10021002109.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 10021002109 = 2311 ⋅4336219.

It can be written as a sum of positive squares in 2 ways, for example, as 32960765601 + 57159246400 = 181551^2 + 239080^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90120012001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90120012011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 59523690 + ... + 59525203.

It is an arithmetic number, because the mean of its divisors is an integer number (22559765413).

Almost surely, 2^90120012001 is an apocalyptic number.

It is an amenable number.

90120012001 is a deficient number, since it is larger than the sum of its proper divisors (119049651).

90120012001 is a wasteful number, since it uses less digits than its factorization.

90120012001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119049650.

The product of its (nonzero) digits is 36, while the sum is 16.

The spelling of 90120012001 in words is "ninety billion, one hundred twenty million, twelve thousand, one".