9318813421 has 4 divisors (see below), whose sum is σ = 9322710012. Its totient is φ = 9314916832.

The previous prime is 9318813419. The next prime is 9318813461. The reversal of 9318813421 is 1243188139.

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 143280900 + 9175532521 = 11970^2 + 95789^2 .

It is a cyclic number.

It is not a de Polignac number, because 9318813421 - 2¹ = 9318813419 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 (9318813461) 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, 1944706 + ... + 1949491.

It is an arithmetic number, because the mean of its divisors is an integer number (2330677503).

Almost surely, 2^9318813421 is an apocalyptic number.

It is an amenable number.

9318813421 is a deficient number, since it is larger than the sum of its proper divisors (3896591).

9318813421 is a wasteful number, since it uses less digits than its factorization.

9318813421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3896590.

The product of its digits is 41472, while the sum is 40.

The square root of 9318813421 is about 96534.0013725734. The cubic root of 9318813421 is about 2104.3608112638.

The spelling of 9318813421 in words is "nine billion, three hundred eighteen million, eight hundred thirteen thousand, four hundred twenty-one".