1840090561 has 4 divisors (see below), whose sum is σ = 1879241472. Its totient is φ = 1800939652.

The previous prime is 1840090547. The next prime is 1840090579. The reversal of 1840090561 is 1650900481.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1840090561 - 2¹³ = 1840082369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1840090501) 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, 19575385 + ... + 19575478.

It is an arithmetic number, because the mean of its divisors is an integer number (469810368).

Almost surely, 2^1840090561 is an apocalyptic number.

It is an amenable number.

1840090561 is a deficient number, since it is larger than the sum of its proper divisors (39150911).

1840090561 is an equidigital number, since it uses as much as digits as its factorization.

1840090561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39150910.

The product of its (nonzero) digits is 8640, while the sum is 34.

The square root of 1840090561 is about 42896.2767731653. The cubic root of 1840090561 is about 1225.4052383578.

The spelling of 1840090561 in words is "one billion, eight hundred forty million, ninety thousand, five hundred sixty-one".