3949052221 has 4 divisors (see below), whose sum is σ = 4013790844. Its totient is φ = 3884313600.

The previous prime is 3949052203. The next prime is 3949052257. The reversal of 3949052221 is 1222509493.

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 87796900 + 3861255321 = 9370^2 + 62139^2 .

It is a cyclic number.

It is not a de Polignac number, because 3949052221 - 2⁹ = 3949051709 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 (3949052201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32369220 + ... + 32369341.

It is an arithmetic number, because the mean of its divisors is an integer number (1003447711).

Almost surely, 2^3949052221 is an apocalyptic number.

It is an amenable number.

3949052221 is a deficient number, since it is larger than the sum of its proper divisors (64738623).

3949052221 is an equidigital number, since it uses as much as digits as its factorization.

3949052221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64738622.

The product of its (nonzero) digits is 38880, while the sum is 37.

The square root of 3949052221 is about 62841.4848726540. The cubic root of 3949052221 is about 1580.6326875174.

The spelling of 3949052221 in words is "three billion, nine hundred forty-nine million, fifty-two thousand, two hundred twenty-one".