1213644617 has 2 divisors, whose sum is σ = 1213644618. Its totient is φ = 1213644616.

The previous prime is 1213644479. The next prime is 1213644661. The reversal of 1213644617 is 7164463121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1174844176 + 38800441 = 34276^2 + 6229^2 .

It is a cyclic number.

It is not a de Polignac number, because 1213644617 - 2¹⁰ = 1213643593 is a prime.

It is not a weakly prime, because it can be changed into another prime (1213641617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606822308 + 606822309.

It is an arithmetic number, because the mean of its divisors is an integer number (606822309).

Almost surely, 2^1213644617 is an apocalyptic number.

It is an amenable number.

1213644617 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213644617 is an equidigital number, since it uses as much as digits as its factorization.

1213644617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 35.

The square root of 1213644617 is about 34837.4025581701. The cubic root of 1213644617 is about 1066.6710574798.

The spelling of 1213644617 in words is "one billion, two hundred thirteen million, six hundred forty-four thousand, six hundred seventeen".