51791893 has 2 divisors, whose sum is σ = 51791894. Its totient is φ = 51791892.

The previous prime is 51791881. The next prime is 51791899. The reversal of 51791893 is 39819715.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49238289 + 2553604 = 7017^2 + 1598^2 .

It is a cyclic number.

It is not a de Polignac number, because 51791893 - 2¹⁷ = 51660821 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51791899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25895946 + 25895947.

It is an arithmetic number, because the mean of its divisors is an integer number (25895947).

Almost surely, 2^51791893 is an apocalyptic number.

It is an amenable number.

51791893 is a deficient number, since it is larger than the sum of its proper divisors (1).

51791893 is an equidigital number, since it uses as much as digits as its factorization.

51791893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68040, while the sum is 43.

The square root of 51791893 is about 7196.6584607024. The cubic root of 51791893 is about 372.7525257943.

The spelling of 51791893 in words is "fifty-one million, seven hundred ninety-one thousand, eight hundred ninety-three".