1867004561 has 2 divisors, whose sum is σ = 1867004562. Its totient is φ = 1867004560.

The previous prime is 1867004539. The next prime is 1867004591. The reversal of 1867004561 is 1654007681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1590414400 + 276590161 = 39880^2 + 16631^2 .

It is a cyclic number.

It is not a de Polignac number, because 1867004561 - 2²⁶ = 1799895697 is a prime.

It is not a weakly prime, because it can be changed into another prime (1867004591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 933502280 + 933502281.

It is an arithmetic number, because the mean of its divisors is an integer number (933502281).

Almost surely, 2^1867004561 is an apocalyptic number.

It is an amenable number.

1867004561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1867004561 is an equidigital number, since it uses as much as digits as its factorization.

1867004561 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 1867004561 is about 43208.8481795106. The cubic root of 1867004561 is about 1231.3507889149.

The spelling of 1867004561 in words is "one billion, eight hundred sixty-seven million, four thousand, five hundred sixty-one".