51812993 has 2 divisors, whose sum is σ = 51812994. Its totient is φ = 51812992.

The previous prime is 51812963. The next prime is 51813001. The reversal of 51812993 is 39921815.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47720464 + 4092529 = 6908^2 + 2023^2 .

It is a cyclic number.

It is not a de Polignac number, because 51812993 - 2¹⁴ = 51796609 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (51812903) 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, 25906496 + 25906497.

It is an arithmetic number, because the mean of its divisors is an integer number (25906497).

Almost surely, 2^51812993 is an apocalyptic number.

It is an amenable number.

51812993 is a deficient number, since it is larger than the sum of its proper divisors (1).

51812993 is an equidigital number, since it uses as much as digits as its factorization.

51812993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 38.

The square root of 51812993 is about 7198.1242695580. The cubic root of 51812993 is about 372.8031386734.

The spelling of 51812993 in words is "fifty-one million, eight hundred twelve thousand, nine hundred ninety-three".