1228312511 has 2 divisors, whose sum is σ = 1228312512. Its totient is φ = 1228312510.

The previous prime is 1228312489. The next prime is 1228312639. The reversal of 1228312511 is 1152138221.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1228312511 - 2³⁰ = 154570687 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1228314511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 614156255 + 614156256.

It is an arithmetic number, because the mean of its divisors is an integer number (614156256).

Almost surely, 2^1228312511 is an apocalyptic number.

1228312511 is a deficient number, since it is larger than the sum of its proper divisors (1).

1228312511 is an equidigital number, since it uses as much as digits as its factorization.

1228312511 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 960, while the sum is 26.

The square root of 1228312511 is about 35047.2896384300. The cubic root of 1228312511 is about 1070.9510602512.

The spelling of 1228312511 in words is "one billion, two hundred twenty-eight million, three hundred twelve thousand, five hundred eleven".