51399893 has 2 divisors, whose sum is σ = 51399894. Its totient is φ = 51399892.

The previous prime is 51399889. The next prime is 51399899. The reversal of 51399893 is 39899315.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33616804 + 17783089 = 5798^2 + 4217^2 .

It is a cyclic number.

It is not a de Polignac number, because 51399893 - 2² = 51399889 is a prime.

It is a super-2 number, since 2×51399893² = 5283898000822898, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51399899) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25699946 + 25699947.

It is an arithmetic number, because the mean of its divisors is an integer number (25699947).

Almost surely, 2^51399893 is an apocalyptic number.

It is an amenable number.

51399893 is a deficient number, since it is larger than the sum of its proper divisors (1).

51399893 is an equidigital number, since it uses as much as digits as its factorization.

51399893 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 262440, while the sum is 47.

The square root of 51399893 is about 7169.3718692784. The cubic root of 51399893 is about 371.8097193321.

The spelling of 51399893 in words is "fifty-one million, three hundred ninety-nine thousand, eight hundred ninety-three".