90981026181 has 6 divisors (see below), whose sum is σ = 131417037830. Its totient is φ = 60654017448.

The previous prime is 90981026177. The next prime is 90981026183. The reversal of 90981026181 is 18162018909.

It can be written as a sum of positive squares in only one way, i.e., 84602448225 + 6378577956 = 290865^2 + 79866^2 .

It is not a de Polignac number, because 90981026181 - 2² = 90981026177 is a prime.

It is a super-2 number, since 2×90981026181² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90981026183) 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 5 ways as a sum of consecutive naturals, for example, 5054501446 + ... + 5054501463.

Almost surely, 2^90981026181 is an apocalyptic number.

It is an amenable number.

90981026181 is a deficient number, since it is larger than the sum of its proper divisors (40436011649).

90981026181 is a wasteful number, since it uses less digits than its factorization.

90981026181 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10109002915 (or 10109002912 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 45.

The spelling of 90981026181 in words is "ninety billion, nine hundred eighty-one million, twenty-six thousand, one hundred eighty-one".