1601621317 has 2 divisors, whose sum is σ = 1601621318. Its totient is φ = 1601621316.

The previous prime is 1601621297. The next prime is 1601621341. The reversal of 1601621317 is 7131261061.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1476941761 + 124679556 = 38431^2 + 11166^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1601621317 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1601621347) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 800810658 + 800810659.

It is an arithmetic number, because the mean of its divisors is an integer number (800810659).

Almost surely, 2^1601621317 is an apocalyptic number.

It is an amenable number.

1601621317 is a deficient number, since it is larger than the sum of its proper divisors (1).

1601621317 is an equidigital number, since it uses as much as digits as its factorization.

1601621317 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 1601621317 is about 40020.2613309808. The cubic root of 1601621317 is about 1170.0020252236.

Adding to 1601621317 its reverse (7131261061), we get a palindrome (8732882378).

The spelling of 1601621317 in words is "one billion, six hundred one million, six hundred twenty-one thousand, three hundred seventeen".