309130307481 has 4 divisors (see below), whose sum is σ = 412173743312. Its totient is φ = 206086871652.

The previous prime is 309130307467. The next prime is 309130307491. The reversal of 309130307481 is 184703031903.

It is a happy number.

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.

It is not a de Polignac number, because 309130307481 - 2¹¹ = 309130305433 is a prime.

It is a super-2 number, since 2×309130307481² (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 (309130307441) 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, 51521717911 + ... + 51521717916.

It is an arithmetic number, because the mean of its divisors is an integer number (103043435828).

Almost surely, 2^309130307481 is an apocalyptic number.

It is an amenable number.

309130307481 is a deficient number, since it is larger than the sum of its proper divisors (103043435831).

309130307481 is a wasteful number, since it uses less digits than its factorization.

309130307481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103043435830.

The product of its (nonzero) digits is 54432, while the sum is 39.

The spelling of 309130307481 in words is "three hundred nine billion, one hundred thirty million, three hundred seven thousand, four hundred eighty-one".