1606980961 has 2 divisors, whose sum is σ = 1606980962. Its totient is φ = 1606980960.

The previous prime is 1606980941. The next prime is 1606980979. The reversal of 1606980961 is 1690896061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1004573025 + 602407936 = 31695^2 + 24544^2 .

It is an emirp because it is prime and its reverse (1690896061) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 1960869091 and 1909680691.

It is a cyclic number.

It is not a de Polignac number, because 1606980961 - 2²³ = 1598592353 is a prime.

It is not a weakly prime, because it can be changed into another prime (1606980931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 803490480 + 803490481.

It is an arithmetic number, because the mean of its divisors is an integer number (803490481).

Almost surely, 2^1606980961 is an apocalyptic number.

It is an amenable number.

1606980961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1606980961 is an equidigital number, since it uses as much as digits as its factorization.

1606980961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 139968, while the sum is 46.

The square root of 1606980961 is about 40087.1670363472. The cubic root of 1606980961 is about 1171.3056651475.

The spelling of 1606980961 in words is "one billion, six hundred six million, nine hundred eighty thousand, nine hundred sixty-one".