1613500221 has 12 divisors (see below), whose sum is σ = 2162373248. Its totient is φ = 1070153664.

The previous prime is 1613500211. The next prime is 1613500237. The reversal of 1613500221 is 1220053161.

It is not a de Polignac number, because 1613500221 - 2⁶ = 1613500157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1613500211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1038181 + ... + 1039733.

Almost surely, 2^1613500221 is an apocalyptic number.

It is an amenable number.

1613500221 is a deficient number, since it is larger than the sum of its proper divisors (548873027).

1613500221 is an frugal number, since it uses more digits than its factorization.

1613500221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3332 (or 1779 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 1613500221 is about 40168.3982877087. The cubic root of 1613500221 is about 1172.8874601409.

Adding to 1613500221 its reverse (1220053161), we get a palindrome (2833553382).

The spelling of 1613500221 in words is "one billion, six hundred thirteen million, five hundred thousand, two hundred twenty-one".