1911535649 has 2 divisors, whose sum is σ = 1911535650. Its totient is φ = 1911535648.

The previous prime is 1911535621. The next prime is 1911535651. The reversal of 1911535649 is 9465351191.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1518505024 + 393030625 = 38968^2 + 19825^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1911535649 is a prime.

Together with 1911535651, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1911535949) 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, 955767824 + 955767825.

It is an arithmetic number, because the mean of its divisors is an integer number (955767825).

Almost surely, 2^1911535649 is an apocalyptic number.

It is an amenable number.

1911535649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1911535649 is an equidigital number, since it uses as much as digits as its factorization.

1911535649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 145800, while the sum is 44.

The square root of 1911535649 is about 43721.1121656346. The cubic root of 1911535649 is about 1241.0638738721.

The spelling of 1911535649 in words is "one billion, nine hundred eleven million, five hundred thirty-five thousand, six hundred forty-nine".