1221627613 has 2 divisors, whose sum is σ = 1221627614. Its totient is φ = 1221627612.

The previous prime is 1221627611. The next prime is 1221627643. The reversal of 1221627613 is 3167261221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1186320249 + 35307364 = 34443^2 + 5942^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221627613 - 2¹ = 1221627611 is a prime.

Together with 1221627611, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1221627611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 610813806 + 610813807.

It is an arithmetic number, because the mean of its divisors is an integer number (610813807).

Almost surely, 2^1221627613 is an apocalyptic number.

It is an amenable number.

1221627613 is a deficient number, since it is larger than the sum of its proper divisors (1).

1221627613 is an equidigital number, since it uses as much as digits as its factorization.

1221627613 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6048, while the sum is 31.

The square root of 1221627613 is about 34951.7898397207. The cubic root of 1221627613 is about 1069.0046973745.

Adding to 1221627613 its reverse (3167261221), we get a palindrome (4388888834).

The spelling of 1221627613 in words is "one billion, two hundred twenty-one million, six hundred twenty-seven thousand, six hundred thirteen".