1641305387 has 2 divisors, whose sum is σ = 1641305388. Its totient is φ = 1641305386.

The previous prime is 1641305381. The next prime is 1641305423. The reversal of 1641305387 is 7835031461.

It is a weak prime.

It is an emirp because it is prime and its reverse (7835031461) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1641305387 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1641305387.

It is not a weakly prime, because it can be changed into another prime (1641305381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820652693 + 820652694.

It is an arithmetic number, because the mean of its divisors is an integer number (820652694).

Almost surely, 2^1641305387 is an apocalyptic number.

1641305387 is a deficient number, since it is larger than the sum of its proper divisors (1).

1641305387 is an equidigital number, since it uses as much as digits as its factorization.

1641305387 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 1641305387 is about 40513.0273739201. The cubic root of 1641305387 is about 1179.5865129348.

The spelling of 1641305387 in words is "one billion, six hundred forty-one million, three hundred five thousand, three hundred eighty-seven".