109785213919 has 2 divisors, whose sum is σ = 109785213920. Its totient is φ = 109785213918.

The previous prime is 109785213917. The next prime is 109785213929. The reversal of 109785213919 is 919312587901.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 109785213919 - 2¹ = 109785213917 is a prime.

It is a super-2 number, since 2×109785213919² (a number of 23 digits) contains 22 as substring.

Together with 109785213917, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 109785213919.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (109785213917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 54892606959 + 54892606960.

It is an arithmetic number, because the mean of its divisors is an integer number (54892606960).

Almost surely, 2^109785213919 is an apocalyptic number.

109785213919 is a deficient number, since it is larger than the sum of its proper divisors (1).

109785213919 is an equidigital number, since it uses as much as digits as its factorization.

109785213919 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1224720, while the sum is 55.

The spelling of 109785213919 in words is "one hundred nine billion, seven hundred eighty-five million, two hundred thirteen thousand, nine hundred nineteen".