9091047018181 has 4 divisors (see below), whose sum is σ = 9091707862572. Its totient is φ = 9090386173792.

The previous prime is 9091047018071. The next prime is 9091047018197. The reversal of 9091047018181 is 1818107401909.

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 4702717530625 + 4388329487556 = 2168575^2 + 2094834^2 .

It is a cyclic number.

It is not a de Polignac number, because 9091047018181 - 2²³ = 9091038629573 is a prime.

It is a super-2 number, since 2×9091047018181² (a number of 27 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 (9091047018281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 330401560 + ... + 330429073.

It is an arithmetic number, because the mean of its divisors is an integer number (2272926965643).

Almost surely, 2^{9091047018181} is an apocalyptic number.

It is an amenable number.

9091047018181 is a deficient number, since it is larger than the sum of its proper divisors (660844391).

9091047018181 is a wasteful number, since it uses less digits than its factorization.

9091047018181 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 660844390.

The product of its (nonzero) digits is 145152, while the sum is 49.

The spelling of 9091047018181 in words is "nine trillion, ninety-one billion, forty-seven million, eighteen thousand, one hundred eighty-one".