307113221538 has 18 divisors (see below), whose sum is σ = 665417074257. Its totient is φ = 102370290120.

The previous prime is 307113221531. The next prime is 307113221567. The reversal of 307113221538 is 835122311703.

It is a happy number.

307113221538 is a `hidden beast` number, since 3 + 0 + 7 + 113 + 2 + 2 + 1 + 538 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 166760339769 + 140352881769 = 408363^2 + 374637^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=391863.

It is not an unprimeable number, because it can be changed into a prime (307113221531) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2285868 + ... + 2416488.

Almost surely, 2^307113221538 is an apocalyptic number.

307113221538 is an abundant number, since it is smaller than the sum of its proper divisors (358303852719).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

307113221538 is an frugal number, since it uses more digits than its factorization.

307113221538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261250 (or 130626 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The spelling of 307113221538 in words is "three hundred seven billion, one hundred thirteen million, two hundred twenty-one thousand, five hundred thirty-eight".