1606984681 has 2 divisors, whose sum is σ = 1606984682. Its totient is φ = 1606984680.

The previous prime is 1606984667. The next prime is 1606984747. The reversal of 1606984681 is 1864896061.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1498928656 + 108056025 = 38716^2 + 10395^2 .

It is a cyclic number.

It is not a de Polignac number, because 1606984681 - 2⁵ = 1606984649 is a prime.

It is a super-2 number, since 2×1606984681² = 5164799529937343522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1606984601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 803492340 + 803492341.

It is an arithmetic number, because the mean of its divisors is an integer number (803492341).

Almost surely, 2^1606984681 is an apocalyptic number.

It is an amenable number.

1606984681 is a deficient number, since it is larger than the sum of its proper divisors (1).

1606984681 is an equidigital number, since it uses as much as digits as its factorization.

1606984681 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 497664, while the sum is 49.

The square root of 1606984681 is about 40087.2134352090. The cubic root of 1606984681 is about 1171.3065689653.

The spelling of 1606984681 in words is "one billion, six hundred six million, nine hundred eighty-four thousand, six hundred eighty-one".