307513813 has 4 divisors (see below), whose sum is σ = 310499488. Its totient is φ = 304528140.

The previous prime is 307513781. The next prime is 307513819. The reversal of 307513813 is 318315703.

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, and also an emirpimes, since its reverse is a distinct semiprime: 318315703 = 149 ⋅2136347.

It is a cyclic number.

It is not a de Polignac number, because 307513813 - 2⁵ = 307513781 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (307513819) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1492683 + ... + 1492888.

It is an arithmetic number, because the mean of its divisors is an integer number (77624872).

Almost surely, 2^307513813 is an apocalyptic number.

It is an amenable number.

307513813 is a deficient number, since it is larger than the sum of its proper divisors (2985675).

307513813 is a wasteful number, since it uses less digits than its factorization.

307513813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2985674.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 307513813 is about 17536.0717665046. The cubic root of 307513813 is about 674.9758111131.

The spelling of 307513813 in words is "three hundred seven million, five hundred thirteen thousand, eight hundred thirteen".