1521616223 has 2 divisors, whose sum is σ = 1521616224. Its totient is φ = 1521616222.

The previous prime is 1521616199. The next prime is 1521616237. The reversal of 1521616223 is 3226161251.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1521616223 - 2¹⁶ = 1521550687 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1521619223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 760808111 + 760808112.

It is an arithmetic number, because the mean of its divisors is an integer number (760808112).

Almost surely, 2^1521616223 is an apocalyptic number.

1521616223 is a deficient number, since it is larger than the sum of its proper divisors (1).

1521616223 is an equidigital number, since it uses as much as digits as its factorization.

1521616223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4320, while the sum is 29.

The square root of 1521616223 is about 39007.8994948459. The cubic root of 1521616223 is about 1150.1867933502.

Adding to 1521616223 its reverse (3226161251), we get a palindrome (4747777474).

The spelling of 1521616223 in words is "one billion, five hundred twenty-one million, six hundred sixteen thousand, two hundred twenty-three".