1601664241 has 2 divisors, whose sum is σ = 1601664242. Its totient is φ = 1601664240.

The previous prime is 1601664227. The next prime is 1601664247. The reversal of 1601664241 is 1424661061.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1217661025 + 384003216 = 34895^2 + 19596^2 .

It is a cyclic number.

It is not a de Polignac number, because 1601664241 - 2²¹ = 1599567089 is a prime.

It is not a weakly prime, because it can be changed into another prime (1601664247) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 800832120 + 800832121.

It is an arithmetic number, because the mean of its divisors is an integer number (800832121).

Almost surely, 2^1601664241 is an apocalyptic number.

It is an amenable number.

1601664241 is a deficient number, since it is larger than the sum of its proper divisors (1).

1601664241 is an equidigital number, since it uses as much as digits as its factorization.

1601664241 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 1601664241 is about 40020.7976057449. The cubic root of 1601664241 is about 1170.0124772819.

The spelling of 1601664241 in words is "one billion, six hundred one million, six hundred sixty-four thousand, two hundred forty-one".