783449734421 has 4 divisors (see below), whose sum is σ = 784363912332. Its totient is φ = 782535556512.

The previous prime is 783449734343. The next prime is 783449734423. The reversal of 783449734421 is 124437944387.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124437944387 = 79 ⋅1575163853.

It can be written as a sum of positive squares in 2 ways, for example, as 463502256100 + 319947478321 = 680810^2 + 565639^2 .

It is a cyclic number.

It is not a de Polignac number, because 783449734421 - 2³⁰ = 782375992597 is a prime.

It is a super-2 number, since 2×783449734421² (a number of 25 digits) 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 (783449734423) 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, 457087670 + ... + 457089383.

It is an arithmetic number, because the mean of its divisors is an integer number (196090978083).

Almost surely, 2^783449734421 is an apocalyptic number.

It is an amenable number.

783449734421 is a deficient number, since it is larger than the sum of its proper divisors (914177911).

783449734421 is an equidigital number, since it uses as much as digits as its factorization.

783449734421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 914177910.

The product of its digits is 16257024, while the sum is 56.

The spelling of 783449734421 in words is "seven hundred eighty-three billion, four hundred forty-nine million, seven hundred thirty-four thousand, four hundred twenty-one".