1219649441 has 4 divisors (see below), whose sum is σ = 1237853232. Its totient is φ = 1201445652.

The previous prime is 1219649413. The next prime is 1219649447. The reversal of 1219649441 is 1449469121.

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: 1449469121 = 587 ⋅2469283.

It is a cyclic number.

It is not a de Polignac number, because 1219649441 - 2²⁶ = 1152540577 is a prime.

It is a super-2 number, since 2×1219649441² = 2975089517863224962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1219649447) 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, 9101795 + ... + 9101928.

It is an arithmetic number, because the mean of its divisors is an integer number (309463308).

Almost surely, 2^1219649441 is an apocalyptic number.

It is an amenable number.

1219649441 is a deficient number, since it is larger than the sum of its proper divisors (18203791).

1219649441 is an equidigital number, since it uses as much as digits as its factorization.

1219649441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18203790.

The product of its digits is 62208, while the sum is 41.

The square root of 1219649441 is about 34923.4797951178. The cubic root of 1219649441 is about 1068.4273753409.

The spelling of 1219649441 in words is "one billion, two hundred nineteen million, six hundred forty-nine thousand, four hundred forty-one".