219427969 has 2 divisors, whose sum is σ = 219427970. Its totient is φ = 219427968.

The previous prime is 219427937. The next prime is 219428039. The reversal of 219427969 is 969724912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 218596225 + 831744 = 14785^2 + 912^2 .

It is a cyclic number.

It is not a de Polignac number, because 219427969 - 2⁵ = 219427937 is a prime.

It is a super-2 number, since 2×219427969² = 96297267158929922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (219427469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 109713984 + 109713985.

It is an arithmetic number, because the mean of its divisors is an integer number (109713985).

Almost surely, 2^219427969 is an apocalyptic number.

It is an amenable number.

219427969 is a deficient number, since it is larger than the sum of its proper divisors (1).

219427969 is an equidigital number, since it uses as much as digits as its factorization.

219427969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 489888, while the sum is 49.

The square root of 219427969 is about 14813.1012620585. The cubic root of 219427969 is about 603.1574009243.

The spelling of 219427969 in words is "two hundred nineteen million, four hundred twenty-seven thousand, nine hundred sixty-nine".