1228521493 has 2 divisors, whose sum is σ = 1228521494. Its totient is φ = 1228521492.

The previous prime is 1228521491. The next prime is 1228521521. The reversal of 1228521493 is 3941258221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1066544964 + 161976529 = 32658^2 + 12727^2 .

It is an emirp because it is prime and its reverse (3941258221) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1228521493 - 2¹ = 1228521491 is a prime.

Together with 1228521491, 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 (1228521491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 614260746 + 614260747.

It is an arithmetic number, because the mean of its divisors is an integer number (614260747).

Almost surely, 2^1228521493 is an apocalyptic number.

It is an amenable number.

1228521493 is a deficient number, since it is larger than the sum of its proper divisors (1).

1228521493 is an equidigital number, since it uses as much as digits as its factorization.

1228521493 is an evil number, because the sum of its binary digits is even.

The product of its digits is 34560, while the sum is 37.

The square root of 1228521493 is about 35050.2709404649. The cubic root of 1228521493 is about 1071.0117931132.

The spelling of 1228521493 in words is "one billion, two hundred twenty-eight million, five hundred twenty-one thousand, four hundred ninety-three".