5121335403391 has 2 divisors, whose sum is σ = 5121335403392. Its totient is φ = 5121335403390.

The previous prime is 5121335403337. The next prime is 5121335403403. The reversal of 5121335403391 is 1933045331215.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 5121335403391 - 2⁹ = 5121335402879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5121335409391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2560667701695 + 2560667701696.

It is an arithmetic number, because the mean of its divisors is an integer number (2560667701696).

Almost surely, 2^{5121335403391} is an apocalyptic number.

5121335403391 is a deficient number, since it is larger than the sum of its proper divisors (1).

5121335403391 is an equidigital number, since it uses as much as digits as its factorization.

5121335403391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145800, while the sum is 40.

The spelling of 5121335403391 in words is "five trillion, one hundred twenty-one billion, three hundred thirty-five million, four hundred three thousand, three hundred ninety-one".