1641540541 has 2 divisors, whose sum is σ = 1641540542. Its totient is φ = 1641540540.

The previous prime is 1641540497. The next prime is 1641540569. The reversal of 1641540541 is 1450451461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1523731225 + 117809316 = 39035^2 + 10854^2 .

It is a cyclic number.

It is not a de Polignac number, because 1641540541 - 2⁷ = 1641540413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1641540581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820770270 + 820770271.

It is an arithmetic number, because the mean of its divisors is an integer number (820770271).

Almost surely, 2^1641540541 is an apocalyptic number.

It is an amenable number.

1641540541 is a deficient number, since it is larger than the sum of its proper divisors (1).

1641540541 is an equidigital number, since it uses as much as digits as its factorization.

1641540541 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9600, while the sum is 31.

The square root of 1641540541 is about 40515.9294722459. The cubic root of 1641540541 is about 1179.6428443653.

The spelling of 1641540541 in words is "one billion, six hundred forty-one million, five hundred forty thousand, five hundred forty-one".