1641003121 has 2 divisors, whose sum is σ = 1641003122. Its totient is φ = 1641003120.

The previous prime is 1641003101. The next prime is 1641003127. The reversal of 1641003121 is 1213001461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1545354721 + 95648400 = 39311^2 + 9780^2 .

It is a cyclic number.

It is not a de Polignac number, because 1641003121 - 2¹¹ = 1641001073 is a prime.

It is not a weakly prime, because it can be changed into another prime (1641003127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820501560 + 820501561.

It is an arithmetic number, because the mean of its divisors is an integer number (820501561).

Almost surely, 2^1641003121 is an apocalyptic number.

It is an amenable number.

1641003121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1641003121 is an equidigital number, since it uses as much as digits as its factorization.

1641003121 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 19.

The square root of 1641003121 is about 40509.2967230980. The cubic root of 1641003121 is about 1179.5140968386.

Adding to 1641003121 its reverse (1213001461), we get a palindrome (2854004582).

The spelling of 1641003121 in words is "one billion, six hundred forty-one million, three thousand, one hundred twenty-one".