1461985009 has 2 divisors, whose sum is σ = 1461985010. Its totient is φ = 1461985008.

The previous prime is 1461984973. The next prime is 1461985037. The reversal of 1461985009 is 9005891641.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1460768400 + 1216609 = 38220^2 + 1103^2 .

It is an emirp because it is prime and its reverse (9005891641) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1461985009 - 2¹⁵ = 1461952241 is a prime.

It is not a weakly prime, because it can be changed into another prime (1461485009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 730992504 + 730992505.

It is an arithmetic number, because the mean of its divisors is an integer number (730992505).

Almost surely, 2^1461985009 is an apocalyptic number.

It is an amenable number.

1461985009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1461985009 is an equidigital number, since it uses as much as digits as its factorization.

1461985009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 77760, while the sum is 43.

The square root of 1461985009 is about 38235.9125561297. The cubic root of 1461985009 is about 1134.9610908667.

The spelling of 1461985009 in words is "one billion, four hundred sixty-one million, nine hundred eighty-five thousand, nine".