1246134821 has 2 divisors, whose sum is σ = 1246134822. Its totient is φ = 1246134820.

The previous prime is 1246134787. The next prime is 1246134823. The reversal of 1246134821 is 1284316421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1069617025 + 176517796 = 32705^2 + 13286^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1246134821 is a prime.

Together with 1246134823, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1246134823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 623067410 + 623067411.

It is an arithmetic number, because the mean of its divisors is an integer number (623067411).

Almost surely, 2^1246134821 is an apocalyptic number.

It is an amenable number.

1246134821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1246134821 is an equidigital number, since it uses as much as digits as its factorization.

1246134821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9216, while the sum is 32.

The square root of 1246134821 is about 35300.6348526482. The cubic root of 1246134821 is about 1076.1058952108.

The spelling of 1246134821 in words is "one billion, two hundred forty-six million, one hundred thirty-four thousand, eight hundred twenty-one".