1640538041 has 2 divisors, whose sum is σ = 1640538042. Its totient is φ = 1640538040.

The previous prime is 1640538023. The next prime is 1640538101. The reversal of 1640538041 is 1408350461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1347991225 + 292546816 = 36715^2 + 17104^2 .

It is a cyclic number.

It is not a de Polignac number, because 1640538041 - 2²⁶ = 1573429177 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1640537989 and 1640538007.

It is not a weakly prime, because it can be changed into another prime (1640538841) 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, 820269020 + 820269021.

It is an arithmetic number, because the mean of its divisors is an integer number (820269021).

Almost surely, 2^1640538041 is an apocalyptic number.

It is an amenable number.

1640538041 is a deficient number, since it is larger than the sum of its proper divisors (1).

1640538041 is an equidigital number, since it uses as much as digits as its factorization.

1640538041 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 1640538041 is about 40503.5559056239. Note that the first 3 decimals coincide. The cubic root of 1640538041 is about 1179.4026568214.

The spelling of 1640538041 in words is "one billion, six hundred forty million, five hundred thirty-eight thousand, forty-one".