1219347799 has 4 divisors (see below), whose sum is σ = 1219443336. Its totient is φ = 1219252264.

The previous prime is 1219347751. The next prime is 1219347803. The reversal of 1219347799 is 9977439121.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 9977439121 = 13 ⋅767495317.

It is a cyclic number.

It is not a de Polignac number, because 1219347799 - 2¹⁹ = 1218823511 is a prime.

It is a super-2 number, since 2×1219347799² = 2973618109852288802, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1219347719) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25009 + ... + 55354.

It is an arithmetic number, because the mean of its divisors is an integer number (304860834).

Almost surely, 2^1219347799 is an apocalyptic number.

1219347799 is a deficient number, since it is larger than the sum of its proper divisors (95537).

1219347799 is an equidigital number, since it uses as much as digits as its factorization.

1219347799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95536.

The product of its digits is 857304, while the sum is 52.

The square root of 1219347799 is about 34919.1609148903. The cubic root of 1219347799 is about 1068.3392874220.

The spelling of 1219347799 in words is "one billion, two hundred nineteen million, three hundred forty-seven thousand, seven hundred ninety-nine".