1219397969 has 4 divisors (see below), whose sum is σ = 1272415296. Its totient is φ = 1166380644.

The previous prime is 1219397953. The next prime is 1219397983. The reversal of 1219397969 is 9697939121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1219397969 - 2⁴ = 1219397953 is a prime.

It is a super-2 number, since 2×1219397969² = 2973862813602649922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1219397929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26508629 + ... + 26508674.

It is an arithmetic number, because the mean of its divisors is an integer number (318103824).

Almost surely, 2^1219397969 is an apocalyptic number.

It is an amenable number.

1219397969 is a deficient number, since it is larger than the sum of its proper divisors (53017327).

1219397969 is an equidigital number, since it uses as much as digits as its factorization.

1219397969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53017326.

The product of its digits is 1653372, while the sum is 56.

The square root of 1219397969 is about 34919.8792810055. The cubic root of 1219397969 is about 1068.3539394754.

The spelling of 1219397969 in words is "one billion, two hundred nineteen million, three hundred ninety-seven thousand, nine hundred sixty-nine".