51388481 has 2 divisors, whose sum is σ = 51388482. Its totient is φ = 51388480.

The previous prime is 51388459. The next prime is 51388507. The reversal of 51388481 is 18488315.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39250225 + 12138256 = 6265^2 + 3484^2 .

It is a cyclic number.

It is not a de Polignac number, because 51388481 - 2¹⁸ = 51126337 is a prime.

It is a super-2 number, since 2×51388481² = 5281551958974722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (51388781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25694240 + 25694241.

It is an arithmetic number, because the mean of its divisors is an integer number (25694241).

Almost surely, 2^51388481 is an apocalyptic number.

It is an amenable number.

51388481 is a deficient number, since it is larger than the sum of its proper divisors (1).

51388481 is an equidigital number, since it uses as much as digits as its factorization.

51388481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30720, while the sum is 38.

The square root of 51388481 is about 7168.5759394736. The cubic root of 51388481 is about 371.7822004254.

The spelling of 51388481 in words is "fifty-one million, three hundred eighty-eight thousand, four hundred eighty-one".