1606404461 has 2 divisors, whose sum is σ = 1606404462. Its totient is φ = 1606404460.

The previous prime is 1606404431. The next prime is 1606404463. The reversal of 1606404461 is 1644046061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1601520361 + 4884100 = 40019^2 + 2210^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1606404461 is a prime.

Together with 1606404463, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1606404463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 803202230 + 803202231.

It is an arithmetic number, because the mean of its divisors is an integer number (803202231).

Almost surely, 2^1606404461 is an apocalyptic number.

It is an amenable number.

1606404461 is a deficient number, since it is larger than the sum of its proper divisors (1).

1606404461 is an equidigital number, since it uses as much as digits as its factorization.

1606404461 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 1606404461 is about 40079.9758108709. The cubic root of 1606404461 is about 1171.1655808326.

The spelling of 1606404461 in words is "one billion, six hundred six million, four hundred four thousand, four hundred sixty-one".