51445993 has 2 divisors, whose sum is σ = 51445994. Its totient is φ = 51445992.

The previous prime is 51445991. The next prime is 51446023. The reversal of 51445993 is 39954415.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50013184 + 1432809 = 7072^2 + 1197^2 .

It is a cyclic number.

It is not a de Polignac number, because 51445993 - 2¹ = 51445991 is a prime.

Together with 51445991, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (51445991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25722996 + 25722997.

It is an arithmetic number, because the mean of its divisors is an integer number (25722997).

Almost surely, 2^51445993 is an apocalyptic number.

It is an amenable number.

51445993 is a deficient number, since it is larger than the sum of its proper divisors (1).

51445993 is an equidigital number, since it uses as much as digits as its factorization.

51445993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 97200, while the sum is 40.

The square root of 51445993 is about 7172.5862141908. The cubic root of 51445993 is about 371.9208434692.

The spelling of 51445993 in words is "fifty-one million, four hundred forty-five thousand, nine hundred ninety-three".