1219734121 has 2 divisors, whose sum is σ = 1219734122. Its totient is φ = 1219734120.

The previous prime is 1219734107. The next prime is 1219734157. The reversal of 1219734121 is 1214379121.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1208605225 + 11128896 = 34765^2 + 3336^2 .

It is a cyclic number.

It is not a de Polignac number, because 1219734121 - 2⁷ = 1219733993 is a prime.

It is not a weakly prime, because it can be changed into another prime (1219734181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 609867060 + 609867061.

It is an arithmetic number, because the mean of its divisors is an integer number (609867061).

Almost surely, 2^1219734121 is an apocalyptic number.

It is an amenable number.

1219734121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1219734121 is an equidigital number, since it uses as much as digits as its factorization.

1219734121 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3024, while the sum is 31.

The square root of 1219734121 is about 34924.6921389438. The cubic root of 1219734121 is about 1068.4521016634.

The spelling of 1219734121 in words is "one billion, two hundred nineteen million, seven hundred thirty-four thousand, one hundred twenty-one".