3317385721 has 8 divisors (see below), whose sum is σ = 3576395144. Its totient is φ = 3058922880.

The previous prime is 3317385667. The next prime is 3317385737. The reversal of 3317385721 is 1275837133.

It can be written as a sum of positive squares in 4 ways, for example, as 212110096 + 3105275625 = 14564^2 + 55725^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3317385721 - 2²¹ = 3315288569 is a prime.

It is a super-4 number, since 4×3317385721⁴ (a number of 39 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3317385751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 123990 + ... + 148351.

It is an arithmetic number, because the mean of its divisors is an integer number (447049393).

Almost surely, 2^3317385721 is an apocalyptic number.

It is an amenable number.

3317385721 is a deficient number, since it is larger than the sum of its proper divisors (259009423).

3317385721 is a wasteful number, since it uses less digits than its factorization.

3317385721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273291.

The product of its digits is 105840, while the sum is 40.

The square root of 3317385721 is about 57596.7509587129. The cubic root of 3317385721 is about 1491.4155160711.

The spelling of 3317385721 in words is "three billion, three hundred seventeen million, three hundred eighty-five thousand, seven hundred twenty-one".