309442573481 has 4 divisors (see below), whose sum is σ = 316989953364. Its totient is φ = 301895193600.

The previous prime is 309442573471. The next prime is 309442573483. The reversal of 309442573481 is 184375244903.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20553523225 + 288889050256 = 143365^2 + 537484^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-309442573481 is a prime.

It is a super-2 number, since 2×309442573481² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (309442573483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3773689880 + ... + 3773689961.

It is an arithmetic number, because the mean of its divisors is an integer number (79247488341).

Almost surely, 2^309442573481 is an apocalyptic number.

It is an amenable number.

309442573481 is a deficient number, since it is larger than the sum of its proper divisors (7547379883).

309442573481 is an equidigital number, since it uses as much as digits as its factorization.

309442573481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7547379882.

The product of its (nonzero) digits is 2903040, while the sum is 50.

The spelling of 309442573481 in words is "three hundred nine billion, four hundred forty-two million, five hundred seventy-three thousand, four hundred eighty-one".