1516676221 has 4 divisors (see below), whose sum is σ = 1517312412. Its totient is φ = 1516040032.

The previous prime is 1516676219. The next prime is 1516676261. The reversal of 1516676221 is 1226766151.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1226766151 = 13 ⋅94366627.

It can be written as a sum of positive squares in 2 ways, for example, as 477903321 + 1038772900 = 21861^2 + 32230^2 .

It is a cyclic number.

It is not a de Polignac number, because 1516676221 - 2¹ = 1516676219 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 (1516676201) 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, 314506 + ... + 319291.

It is an arithmetic number, because the mean of its divisors is an integer number (379328103).

Almost surely, 2^1516676221 is an apocalyptic number.

It is an amenable number.

1516676221 is a deficient number, since it is larger than the sum of its proper divisors (636191).

1516676221 is an equidigital number, since it uses as much as digits as its factorization.

1516676221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636190.

The product of its digits is 30240, while the sum is 37.

The square root of 1516676221 is about 38944.5274846159. The cubic root of 1516676221 is about 1148.9407312199.

The spelling of 1516676221 in words is "one billion, five hundred sixteen million, six hundred seventy-six thousand, two hundred twenty-one".