309143784049 has 3 divisors (see below), whose sum is σ = 309144340057. Its totient is φ = 309143228042.

The previous prime is 309143784023. The next prime is 309143784071. The reversal of 309143784049 is 940487341903.

The square root of 309143784049 is 556007.

It is a perfect power (a square), and thus also a powerful number.

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.

It is not a de Polignac number, because 309143784049 - 2³³ = 300553849457 is a prime.

It is a super-2 number, since 2×309143784049² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 309143783987 and 309143784005.

It is not an unprimeable number, because it can be changed into a prime (309143784149) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 278004 + ... + 834010.

Almost surely, 2^309143784049 is an apocalyptic number.

309143784049 is the 556007-th square number.

309143784049 is the 278004-th centered octagonal number.

It is an amenable number.

309143784049 is a deficient number, since it is larger than the sum of its proper divisors (556008).

309143784049 is an frugal number, since it uses more digits than its factorization.

309143784049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1112014 (or 556007 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 52.

The spelling of 309143784049 in words is "three hundred nine billion, one hundred forty-three million, seven hundred eighty-four thousand, forty-nine".