309473230781 has 36 divisors (see below), whose sum is σ = 388344645504. Its totient is φ = 244421049600.

The previous prime is 309473230721. The next prime is 309473230817. The reversal of 309473230781 is 187032374903.

It is a happy number.

It is not a de Polignac number, because 309473230781 - 2¹⁴ = 309473214397 is a prime.

It is a super-2 number, since 2×309473230781² (a number of 24 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 (309473230721) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 249236 + ... + 825266.

It is an arithmetic number, because the mean of its divisors is an integer number (10787351264).

Almost surely, 2^309473230781 is an apocalyptic number.

It is an amenable number.

309473230781 is a deficient number, since it is larger than the sum of its proper divisors (78871414723).

309473230781 is a wasteful number, since it uses less digits than its factorization.

309473230781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576102 (or 576072 counting only the distinct ones).

The product of its (nonzero) digits is 762048, while the sum is 47.

The spelling of 309473230781 in words is "three hundred nine billion, four hundred seventy-three million, two hundred thirty thousand, seven hundred eighty-one".