1641465191 has 2 divisors, whose sum is σ = 1641465192. Its totient is φ = 1641465190.

The previous prime is 1641465167. The next prime is 1641465223. The reversal of 1641465191 is 1915641461.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1641465191 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1641465131) 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, 820732595 + 820732596.

It is an arithmetic number, because the mean of its divisors is an integer number (820732596).

Almost surely, 2^1641465191 is an apocalyptic number.

1641465191 is a deficient number, since it is larger than the sum of its proper divisors (1).

1641465191 is an equidigital number, since it uses as much as digits as its factorization.

1641465191 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 25920, while the sum is 38.

The square root of 1641465191 is about 40514.9995804023. Note that the first 3 decimals coincide. The cubic root of 1641465191 is about 1179.6247947657.

The spelling of 1641465191 in words is "one billion, six hundred forty-one million, four hundred sixty-five thousand, one hundred ninety-one".