3701618221 has 6 divisors (see below), whose sum is σ = 4305964110. Its totient is φ = 3172815576.

The previous prime is 3701618159. The next prime is 3701618273. The reversal of 3701618221 is 1228161073.

3701618221 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 1990141321 + 1711476900 = 44611^2 + 41370^2 .

It is not a de Polignac number, because 3701618221 - 2²³ = 3693229613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3701618821) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37771566 + ... + 37771663.

It is an arithmetic number, because the mean of its divisors is an integer number (717660685).

Almost surely, 2^3701618221 is an apocalyptic number.

It is an amenable number.

3701618221 is a deficient number, since it is larger than the sum of its proper divisors (604345889).

3701618221 is an equidigital number, since it uses as much as digits as its factorization.

3701618221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75543243 (or 75543236 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 3701618221 is about 60840.9255435846. The cubic root of 3701618221 is about 1546.9058247511.

Adding to 3701618221 its reverse (1228161073), we get a palindrome (4929779294).

The spelling of 3701618221 in words is "three billion, seven hundred one million, six hundred eighteen thousand, two hundred twenty-one".