219149969 has 2 divisors, whose sum is σ = 219149970. Its totient is φ = 219149968.

The previous prime is 219149947. The next prime is 219150007. The reversal of 219149969 is 969941912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 201299344 + 17850625 = 14188^2 + 4225^2 .

It is a cyclic number.

It is not a de Polignac number, because 219149969 - 2²⁰ = 218101393 is a prime.

It is a super-2 number, since 2×219149969² = 96053417825401922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (219149929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109574984 + 109574985.

It is an arithmetic number, because the mean of its divisors is an integer number (109574985).

Almost surely, 2^219149969 is an apocalyptic number.

It is an amenable number.

219149969 is a deficient number, since it is larger than the sum of its proper divisors (1).

219149969 is an equidigital number, since it uses as much as digits as its factorization.

219149969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 314928, while the sum is 50.

The square root of 219149969 is about 14803.7147027359. The cubic root of 219149969 is about 602.9025737630.

The spelling of 219149969 in words is "two hundred nineteen million, one hundred forty-nine thousand, nine hundred sixty-nine".