5251426121261 has 2 divisors, whose sum is σ = 5251426121262. Its totient is φ = 5251426121260.

The previous prime is 5251426121203. The next prime is 5251426121287. The reversal of 5251426121261 is 1621216241525.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4338243294025 + 913182827236 = 2082845^2 + 955606^2 .

It is a cyclic number.

It is not a de Polignac number, because 5251426121261 - 2⁶ = 5251426121197 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5251426123261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2625713060630 + 2625713060631.

It is an arithmetic number, because the mean of its divisors is an integer number (2625713060631).

Almost surely, 2^{5251426121261} is an apocalyptic number.

It is an amenable number.

5251426121261 is a deficient number, since it is larger than the sum of its proper divisors (1).

5251426121261 is an equidigital number, since it uses as much as digits as its factorization.

5251426121261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 57600, while the sum is 38.

The spelling of 5251426121261 in words is "five trillion, two hundred fifty-one billion, four hundred twenty-six million, one hundred twenty-one thousand, two hundred sixty-one".