9042090781 has 4 divisors (see below), whose sum is σ = 9573978492. Its totient is φ = 8510203072.

The previous prime is 9042090721. The next prime is 9042090787. The reversal of 9042090781 is 1870902409.

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 7826940900 + 1215149881 = 88470^2 + 34859^2 .

It is a cyclic number.

It is not a de Polignac number, because 9042090781 - 2¹³ = 9042082589 is a prime.

It is a super-2 number, since 2×9042090781² (a number of 21 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 (9042090787) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 265943830 + ... + 265943863.

It is an arithmetic number, because the mean of its divisors is an integer number (2393494623).

Almost surely, 2^9042090781 is an apocalyptic number.

It is an amenable number.

9042090781 is a deficient number, since it is larger than the sum of its proper divisors (531887711).

9042090781 is a wasteful number, since it uses less digits than its factorization.

9042090781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 531887710.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 9042090781 is about 95089.9089335982. The cubic root of 9042090781 is about 2083.3214608020.

The spelling of 9042090781 in words is "nine billion, forty-two million, ninety thousand, seven hundred eighty-one".