50621001391 has 2 divisors, whose sum is σ = 50621001392. Its totient is φ = 50621001390.

The previous prime is 50621001331. The next prime is 50621001419. The reversal of 50621001391 is 19310012605.

It is an a-pointer prime, because the next prime (50621001419) can be obtained adding 50621001391 to its sum of digits (28).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 50621001391 - 2²⁷ = 50486783663 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (50621001331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25310500695 + 25310500696.

It is an arithmetic number, because the mean of its divisors is an integer number (25310500696).

Almost surely, 2^50621001391 is an apocalyptic number.

50621001391 is a deficient number, since it is larger than the sum of its proper divisors (1).

50621001391 is an equidigital number, since it uses as much as digits as its factorization.

50621001391 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1620, while the sum is 28.

Adding to 50621001391 its reverse (19310012605), we get a palindrome (69931013996).

The spelling of 50621001391 in words is "fifty billion, six hundred twenty-one million, one thousand, three hundred ninety-one".