3256907921 has 4 divisors (see below), whose sum is σ = 3301523172. Its totient is φ = 3212292672.

The previous prime is 3256907917. The next prime is 3256907947. The reversal of 3256907921 is 1297096523.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1297096523 = 23 ⋅56395501.

It can be written as a sum of positive squares in 2 ways, for example, as 1557407296 + 1699500625 = 39464^2 + 41225^2 .

It is a cyclic number.

It is not a de Polignac number, because 3256907921 - 2² = 3256907917 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3256907221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22307516 + ... + 22307661.

It is an arithmetic number, because the mean of its divisors is an integer number (825380793).

Almost surely, 2^3256907921 is an apocalyptic number.

It is an amenable number.

3256907921 is a deficient number, since it is larger than the sum of its proper divisors (44615251).

3256907921 is an equidigital number, since it uses as much as digits as its factorization.

3256907921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44615250.

The product of its (nonzero) digits is 204120, while the sum is 44.

The square root of 3256907921 is about 57069.3255698716. The cubic root of 3256907921 is about 1482.2967627458.

The spelling of 3256907921 in words is "three billion, two hundred fifty-six million, nine hundred seven thousand, nine hundred twenty-one".