1228081931 has 2 divisors, whose sum is σ = 1228081932. Its totient is φ = 1228081930.

The previous prime is 1228081913. The next prime is 1228081949. The reversal of 1228081931 is 1391808221.

Together with previous prime (1228081913) it forms an Ormiston pair, because they use the same digits, order apart.

It is a balanced prime because it is at equal distance from previous prime (1228081913) and next prime (1228081949).

It is a cyclic number.

It is not a de Polignac number, because 1228081931 - 2¹⁴ = 1228065547 is a prime.

It is a super-2 number, since 2×1228081931² = 3016370458497377522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1228081891 and 1228081900.

It is not a weakly prime, because it can be changed into another prime (1228081831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 614040965 + 614040966.

It is an arithmetic number, because the mean of its divisors is an integer number (614040966).

Almost surely, 2^1228081931 is an apocalyptic number.

1228081931 is a deficient number, since it is larger than the sum of its proper divisors (1).

1228081931 is an equidigital number, since it uses as much as digits as its factorization.

1228081931 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6912, while the sum is 35.

The square root of 1228081931 is about 35043.9999286611. Note that the first 4 decimals coincide. The cubic root of 1228081931 is about 1070.8840427382.

The spelling of 1228081931 in words is "one billion, two hundred twenty-eight million, eighty-one thousand, nine hundred thirty-one".