1228782901 has 2 divisors, whose sum is σ = 1228782902. Its totient is φ = 1228782900.

The previous prime is 1228782859. The next prime is 1228782923. The reversal of 1228782901 is 1092878221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1165198225 + 63584676 = 34135^2 + 7974^2 .

It is a cyclic number.

It is not a de Polignac number, because 1228782901 - 2⁷ = 1228782773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1228782601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 614391450 + 614391451.

It is an arithmetic number, because the mean of its divisors is an integer number (614391451).

Almost surely, 2^1228782901 is an apocalyptic number.

It is an amenable number.

1228782901 is a deficient number, since it is larger than the sum of its proper divisors (1).

1228782901 is an equidigital number, since it uses as much as digits as its factorization.

1228782901 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32256, while the sum is 40.

The square root of 1228782901 is about 35053.9997860444. Note that the first 3 decimals coincide. The cubic root of 1228782901 is about 1071.0877519513.

The spelling of 1228782901 in words is "one billion, two hundred twenty-eight million, seven hundred eighty-two thousand, nine hundred one".