1641002191 has 2 divisors, whose sum is σ = 1641002192. Its totient is φ = 1641002190.

The previous prime is 1641002173. The next prime is 1641002261. The reversal of 1641002191 is 1912001461.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1641002191 - 2¹¹ = 1641000143 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1641002591) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 820501095 + 820501096.

It is an arithmetic number, because the mean of its divisors is an integer number (820501096).

Almost surely, 2^1641002191 is an apocalyptic number.

1641002191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1641002191 is an equidigital number, since it uses as much as digits as its factorization.

1641002191 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 25.

The square root of 1641002191 is about 40509.2852442499. The cubic root of 1641002191 is about 1179.5138740179.

The spelling of 1641002191 in words is "one billion, six hundred forty-one million, two thousand, one hundred ninety-one".