1601806961 has 2 divisors, whose sum is σ = 1601806962. Its totient is φ = 1601806960.

The previous prime is 1601806937. The next prime is 1601806981. The reversal of 1601806961 is 1696081061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1091046961 + 510760000 = 33031^2 + 22600^2 .

It is an emirp because it is prime and its reverse (1696081061) is a distict prime. It is also a bemirp because it and its reverse can be mirrored producing other two distinct primes, 1969081091 and 1901809691.

It is a cyclic number.

It is not a de Polignac number, because 1601806961 - 2⁶ = 1601806897 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (1601806981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 800903480 + 800903481.

It is an arithmetic number, because the mean of its divisors is an integer number (800903481).

Almost surely, 2^1601806961 is an apocalyptic number.

It is an amenable number.

1601806961 is a deficient number, since it is larger than the sum of its proper divisors (1).

1601806961 is an equidigital number, since it uses as much as digits as its factorization.

1601806961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 1601806961 is about 40022.5806389343. The cubic root of 1601806961 is about 1170.0472284732.

The spelling of 1601806961 in words is "one billion, six hundred one million, eight hundred six thousand, nine hundred sixty-one".