1210123489 has 2 divisors, whose sum is σ = 1210123490. Its totient is φ = 1210123488.

The previous prime is 1210123451. The next prime is 1210123511. The reversal of 1210123489 is 9843210121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 700131600 + 509991889 = 26460^2 + 22583^2 .

It is a cyclic number.

It is not a de Polignac number, because 1210123489 - 2²⁵ = 1176569057 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1210123489.

It is not a weakly prime, because it can be changed into another prime (1210123589) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605061744 + 605061745.

It is an arithmetic number, because the mean of its divisors is an integer number (605061745).

Almost surely, 2^1210123489 is an apocalyptic number.

It is an amenable number.

1210123489 is a deficient number, since it is larger than the sum of its proper divisors (1).

1210123489 is an equidigital number, since it uses as much as digits as its factorization.

1210123489 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 1210123489 is about 34786.8292461385. The cubic root of 1210123489 is about 1065.6384862648.

The spelling of 1210123489 in words is "one billion, two hundred ten million, one hundred twenty-three thousand, four hundred eighty-nine".