3491721216 has 104 divisors (see below), whose sum is σ = 10344905360. Its totient is φ = 1163870208.

The previous prime is 3491721203. The next prime is 3491721221. The reversal of 3491721216 is 6121271943.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 94806 + ... + 126378.

Almost surely, 2^3491721216 is an apocalyptic number.

3491721216 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3491721216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5172452680).

3491721216 is an abundant number, since it is smaller than the sum of its proper divisors (6853184144).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3491721216 is an equidigital number, since it uses as much as digits as its factorization.

3491721216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31606 (or 31578 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 3491721216 is about 59090.7879114841. The cubic root of 3491721216 is about 1517.0964330104.

The spelling of 3491721216 in words is "three billion, four hundred ninety-one million, seven hundred twenty-one thousand, two hundred sixteen".