1641539 has 2 divisors, whose sum is σ = 1641540. Its totient is φ = 1641538.

The previous prime is 1641509. The next prime is 1641559. The reversal of 1641539 is 9351461.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1641539 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1641509) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820769 + 820770.

It is an arithmetic number, because the mean of its divisors is an integer number (820770).

2^1641539 is an apocalyptic number.

1641539 is a deficient number, since it is larger than the sum of its proper divisors (1).

1641539 is an equidigital number, since it uses as much as digits as its factorization.

1641539 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3240, while the sum is 29.

The square root of 1641539 is about 1281.2255851332. The cubic root of 1641539 is about 117.9642475234.

The spelling of 1641539 in words is "one million, six hundred forty-one thousand, five hundred thirty-nine".