1911216287 has 2 divisors, whose sum is σ = 1911216288. Its totient is φ = 1911216286.

The previous prime is 1911216283. The next prime is 1911216301. The reversal of 1911216287 is 7826121191.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1911216287 - 2² = 1911216283 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1911216287.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1911216283) 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, 955608143 + 955608144.

It is an arithmetic number, because the mean of its divisors is an integer number (955608144).

Almost surely, 2^1911216287 is an apocalyptic number.

1911216287 is a deficient number, since it is larger than the sum of its proper divisors (1).

1911216287 is an equidigital number, since it uses as much as digits as its factorization.

1911216287 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 38.

The square root of 1911216287 is about 43717.4597500815. The cubic root of 1911216287 is about 1240.9947547992.

The spelling of 1911216287 in words is "one billion, nine hundred eleven million, two hundred sixteen thousand, two hundred eighty-seven".