219020805 has 48 divisors (see below), whose sum is σ = 391503216. Its totient is φ = 113218560.

The previous prime is 219020783. The next prime is 219020807. The reversal of 219020805 is 508020912.

It can be written as a sum of positive squares in 8 ways, for example, as 10404 + 219010401 = 102^2 + 14799^2 .

It is not a de Polignac number, because 219020805 - 2⁵ = 219020773 is a prime.

It is a super-2 number, since 2×219020805² = 95940226045696050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (219020807) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 199839 + ... + 200931.

It is an arithmetic number, because the mean of its divisors is an integer number (8156317).

Almost surely, 2^219020805 is an apocalyptic number.

It is an amenable number.

219020805 is a deficient number, since it is larger than the sum of its proper divisors (172482411).

219020805 is a wasteful number, since it uses less digits than its factorization.

219020805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1238 (or 1235 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 219020805 is about 14799.3515060627. The cubic root of 219020805 is about 602.7841029694.

The spelling of 219020805 in words is "two hundred nineteen million, twenty thousand, eight hundred five".