1219471911 has 12 divisors (see below), whose sum is σ = 2013096592. Its totient is φ = 696841056.

The previous prime is 1219471867. The next prime is 1219471933. The reversal of 1219471911 is 1191749121.

It is a happy number.

It is not a de Polignac number, because 1219471911 - 2¹⁰ = 1219470887 is a prime.

It is a super-2 number, since 2×1219471911² = 2974223483435983842, 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 (1219471511) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9678286 + ... + 9678411.

Almost surely, 2^1219471911 is an apocalyptic number.

1219471911 is a deficient number, since it is larger than the sum of its proper divisors (793624681).

1219471911 is a wasteful number, since it uses less digits than its factorization.

1219471911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19356710 (or 19356707 counting only the distinct ones).

The product of its digits is 4536, while the sum is 36.

The square root of 1219471911 is about 34920.9380028658. The cubic root of 1219471911 is about 1068.3755333636.

The spelling of 1219471911 in words is "one billion, two hundred nineteen million, four hundred seventy-one thousand, nine hundred eleven".