1601103521 has 2 divisors, whose sum is σ = 1601103522. Its totient is φ = 1601103520.

The previous prime is 1601103487. The next prime is 1601103557. The reversal of 1601103521 is 1253011061.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1182328225 + 418775296 = 34385^2 + 20464^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1601103521 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1601103493 and 1601103502.

It is not a weakly prime, because it can be changed into another prime (1601103421) 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, 800551760 + 800551761.

It is an arithmetic number, because the mean of its divisors is an integer number (800551761).

Almost surely, 2^1601103521 is an apocalyptic number.

It is an amenable number.

1601103521 is a deficient number, since it is larger than the sum of its proper divisors (1).

1601103521 is an equidigital number, since it uses as much as digits as its factorization.

1601103521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 180, while the sum is 20.

The square root of 1601103521 is about 40013.7916348851. The cubic root of 1601103521 is about 1169.8759264052.

Adding to 1601103521 its reverse (1253011061), we get a palindrome (2854114582).

The spelling of 1601103521 in words is "one billion, six hundred one million, one hundred three thousand, five hundred twenty-one".