1663281229 has 2 divisors, whose sum is σ = 1663281230. Its totient is φ = 1663281228.

The previous prime is 1663281211. The next prime is 1663281251. The reversal of 1663281229 is 9221823661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1599840004 + 63441225 = 39998^2 + 7965^2 .

It is an emirp because it is prime and its reverse (9221823661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1663281229 - 2⁵ = 1663281197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1663281191 and 1663281200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1663281209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 831640614 + 831640615.

It is an arithmetic number, because the mean of its divisors is an integer number (831640615).

Almost surely, 2^1663281229 is an apocalyptic number.

It is an amenable number.

1663281229 is a deficient number, since it is larger than the sum of its proper divisors (1).

1663281229 is an equidigital number, since it uses as much as digits as its factorization.

1663281229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 40.

The square root of 1663281229 is about 40783.3449952306. The cubic root of 1663281229 is about 1184.8277812949.

The spelling of 1663281229 in words is "one billion, six hundred sixty-three million, two hundred eighty-one thousand, two hundred twenty-nine".