1018219691 has 2 divisors, whose sum is σ = 1018219692. Its totient is φ = 1018219690.

The previous prime is 1018219679. The next prime is 1018219693. The reversal of 1018219691 is 1969128101.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1018219691 - 2⁶ = 1018219627 is a prime.

Together with 1018219693, 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 (1018219693) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 509109845 + 509109846.

It is an arithmetic number, because the mean of its divisors is an integer number (509109846).

Almost surely, 2^1018219691 is an apocalyptic number.

1018219691 is a deficient number, since it is larger than the sum of its proper divisors (1).

1018219691 is an equidigital number, since it uses as much as digits as its factorization.

1018219691 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 38.

The square root of 1018219691 is about 31909.5548543066. The cubic root of 1018219691 is about 1006.0367150746.

The spelling of 1018219691 in words is "one billion, eighteen million, two hundred nineteen thousand, six hundred ninety-one".