1246258561 has 2 divisors, whose sum is σ = 1246258562. Its totient is φ = 1246258560.

The previous prime is 1246258523. The next prime is 1246258567. The reversal of 1246258561 is 1658526421.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 639128961 + 607129600 = 25281^2 + 24640^2 .

It is an emirp because it is prime and its reverse (1658526421) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1246258561 - 2²³ = 1237869953 is a prime.

It is not a weakly prime, because it can be changed into another prime (1246258567) 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, 623129280 + 623129281.

It is an arithmetic number, because the mean of its divisors is an integer number (623129281).

Almost surely, 2^1246258561 is an apocalyptic number.

It is an amenable number.

1246258561 is a deficient number, since it is larger than the sum of its proper divisors (1).

1246258561 is an equidigital number, since it uses as much as digits as its factorization.

1246258561 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 115200, while the sum is 40.

The square root of 1246258561 is about 35302.3874688384. The cubic root of 1246258561 is about 1076.1415127951.

The spelling of 1246258561 in words is "one billion, two hundred forty-six million, two hundred fifty-eight thousand, five hundred sixty-one".