51378823 has 2 divisors, whose sum is σ = 51378824. Its totient is φ = 51378822.

The previous prime is 51378799. The next prime is 51378827. The reversal of 51378823 is 32887315.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51378823 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51378827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25689411 + 25689412.

It is an arithmetic number, because the mean of its divisors is an integer number (25689412).

Almost surely, 2^51378823 is an apocalyptic number.

51378823 is a deficient number, since it is larger than the sum of its proper divisors (1).

51378823 is an equidigital number, since it uses as much as digits as its factorization.

51378823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 40320, while the sum is 37.

The square root of 51378823 is about 7167.9022733293. The cubic root of 51378823 is about 371.7589079327.

The spelling of 51378823 in words is "fifty-one million, three hundred seventy-eight thousand, eight hundred twenty-three".