1228312639 has 2 divisors, whose sum is σ = 1228312640. Its totient is φ = 1228312638.

The previous prime is 1228312511. The next prime is 1228312651. The reversal of 1228312639 is 9362138221.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1228312639 - 2⁷ = 1228312511 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1228312598 and 1228312607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1228352639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 614156319 + 614156320.

It is an arithmetic number, because the mean of its divisors is an integer number (614156320).

Almost surely, 2^1228312639 is an apocalyptic number.

1228312639 is a deficient number, since it is larger than the sum of its proper divisors (1).

1228312639 is an equidigital number, since it uses as much as digits as its factorization.

1228312639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 31104, while the sum is 37.

The square root of 1228312639 is about 35047.2914645340. The cubic root of 1228312639 is about 1070.9510974517.

The spelling of 1228312639 in words is "one billion, two hundred twenty-eight million, three hundred twelve thousand, six hundred thirty-nine".