1641205141 has 2 divisors, whose sum is σ = 1641205142. Its totient is φ = 1641205140.

The previous prime is 1641205103. The next prime is 1641205151. The reversal of 1641205141 is 1415021461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 853224100 + 787981041 = 29210^2 + 28071^2 .

It is a cyclic number.

It is not a de Polignac number, because 1641205141 - 2¹⁵ = 1641172373 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1641205151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820602570 + 820602571.

It is an arithmetic number, because the mean of its divisors is an integer number (820602571).

Almost surely, 2^1641205141 is an apocalyptic number.

It is an amenable number.

1641205141 is a deficient number, since it is larger than the sum of its proper divisors (1).

1641205141 is an equidigital number, since it uses as much as digits as its factorization.

1641205141 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 1641205141 is about 40511.7901480544. The cubic root of 1641205141 is about 1179.5624972463.

The spelling of 1641205141 in words is "one billion, six hundred forty-one million, two hundred five thousand, one hundred forty-one".