1246721117 has 2 divisors, whose sum is σ = 1246721118. Its totient is φ = 1246721116.

The previous prime is 1246721089. The next prime is 1246721123. The reversal of 1246721117 is 7111276421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1091245156 + 155475961 = 33034^2 + 12469^2 .

It is a cyclic number.

It is not a de Polignac number, because 1246721117 - 2¹⁴ = 1246704733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1246721717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 623360558 + 623360559.

It is an arithmetic number, because the mean of its divisors is an integer number (623360559).

Almost surely, 2^1246721117 is an apocalyptic number.

It is an amenable number.

1246721117 is a deficient number, since it is larger than the sum of its proper divisors (1).

1246721117 is an equidigital number, since it uses as much as digits as its factorization.

1246721117 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4704, while the sum is 32.

The square root of 1246721117 is about 35308.9382026704. The cubic root of 1246721117 is about 1076.2746350213.

Adding to 1246721117 its reverse (7111276421), we get a palindrome (8357997538).

The spelling of 1246721117 in words is "one billion, two hundred forty-six million, seven hundred twenty-one thousand, one hundred seventeen".