51594421 has 2 divisors, whose sum is σ = 51594422. Its totient is φ = 51594420.

The previous prime is 51594419. The next prime is 51594427. The reversal of 51594421 is 12449515.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41602500 + 9991921 = 6450^2 + 3161^2 .

It is a cyclic number.

It is not a de Polignac number, because 51594421 - 2¹ = 51594419 is a prime.

Together with 51594419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51594427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25797210 + 25797211.

It is an arithmetic number, because the mean of its divisors is an integer number (25797211).

Almost surely, 2^51594421 is an apocalyptic number.

It is an amenable number.

51594421 is a deficient number, since it is larger than the sum of its proper divisors (1).

51594421 is an equidigital number, since it uses as much as digits as its factorization.

51594421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7200, while the sum is 31.

The square root of 51594421 is about 7182.9256574184. The cubic root of 51594421 is about 372.2781791208.

The spelling of 51594421 in words is "fifty-one million, five hundred ninety-four thousand, four hundred twenty-one".