1608901001 has 2 divisors, whose sum is σ = 1608901002. Its totient is φ = 1608901000.

The previous prime is 1608900977. The next prime is 1608901027. The reversal of 1608901001 is 1001098061.

It is an a-pointer prime, because the next prime (1608901027) can be obtained adding 1608901001 to its sum of digits (26).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1595203600 + 13697401 = 39940^2 + 3701^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1608901001 is a prime.

It is not a weakly prime, because it can be changed into another prime (1608901051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 804450500 + 804450501.

It is an arithmetic number, because the mean of its divisors is an integer number (804450501).

Almost surely, 2^1608901001 is an apocalyptic number.

It is an amenable number.

1608901001 is a deficient number, since it is larger than the sum of its proper divisors (1).

1608901001 is an equidigital number, since it uses as much as digits as its factorization.

1608901001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 26.

The square root of 1608901001 is about 40111.1081995998. The cubic root of 1608901001 is about 1171.7719761339.

Adding to 1608901001 its reverse (1001098061), we get a palindrome (2609999062).

The spelling of 1608901001 in words is "one billion, six hundred eight million, nine hundred one thousand, one".