1228293889 has 2 divisors, whose sum is σ = 1228293890. Its totient is φ = 1228293888.

The previous prime is 1228293853. The next prime is 1228293901. The reversal of 1228293889 is 9883928221.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1058851600 + 169442289 = 32540^2 + 13017^2 .

It is a cyclic number.

It is not a de Polignac number, because 1228293889 - 2²¹ = 1226196737 is a prime.

It is not a weakly prime, because it can be changed into another prime (1228294889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 614146944 + 614146945.

It is an arithmetic number, because the mean of its divisors is an integer number (614146945).

Almost surely, 2^1228293889 is an apocalyptic number.

It is an amenable number.

1228293889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1228293889 is an equidigital number, since it uses as much as digits as its factorization.

1228293889 is an evil number, because the sum of its binary digits is even.

The product of its digits is 995328, while the sum is 52.

The square root of 1228293889 is about 35047.0239678065. The cubic root of 1228293889 is about 1070.9456481238.

The spelling of 1228293889 in words is "one billion, two hundred twenty-eight million, two hundred ninety-three thousand, eight hundred eighty-nine".