1219441897 has 4 divisors (see below), whose sum is σ = 1220470416. Its totient is φ = 1218413380.

The previous prime is 1219441889. The next prime is 1219441903. The reversal of 1219441897 is 7981449121.

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, and also an emirpimes, since its reverse is a distinct semiprime: 7981449121 = 23 ⋅347019527.

It is a cyclic number.

It is not a de Polignac number, because 1219441897 - 2³ = 1219441889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1219441877) 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, 512479 + ... + 514852.

It is an arithmetic number, because the mean of its divisors is an integer number (305117604).

Almost surely, 2^1219441897 is an apocalyptic number.

It is an amenable number.

1219441897 is a deficient number, since it is larger than the sum of its proper divisors (1028519).

1219441897 is a wasteful number, since it uses less digits than its factorization.

1219441897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1028518.

The product of its digits is 145152, while the sum is 46.

The square root of 1219441897 is about 34920.5082580423. The cubic root of 1219441897 is about 1068.3667682345.

The spelling of 1219441897 in words is "one billion, two hundred nineteen million, four hundred forty-one thousand, eight hundred ninety-seven".