1641247511 has 2 divisors, whose sum is σ = 1641247512. Its totient is φ = 1641247510.

The previous prime is 1641247483. The next prime is 1641247513. The reversal of 1641247511 is 1157421461.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1641247511 is a prime.

Together with 1641247513, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1641247513) 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, 820623755 + 820623756.

It is an arithmetic number, because the mean of its divisors is an integer number (820623756).

Almost surely, 2^1641247511 is an apocalyptic number.

1641247511 is a deficient number, since it is larger than the sum of its proper divisors (1).

1641247511 is an equidigital number, since it uses as much as digits as its factorization.

1641247511 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6720, while the sum is 32.

The square root of 1641247511 is about 40512.3130788653. The cubic root of 1641247511 is about 1179.5726478427.

Adding to 1641247511 its reverse (1157421461), we get a palindrome (2798668972).

The spelling of 1641247511 in words is "one billion, six hundred forty-one million, two hundred forty-seven thousand, five hundred eleven".