51378799 has 2 divisors, whose sum is σ = 51378800. Its totient is φ = 51378798.

The previous prime is 51378779. The next prime is 51378823. The reversal of 51378799 is 99787315.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51378799 - 2⁷ = 51378671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51378779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25689399 + 25689400.

It is an arithmetic number, because the mean of its divisors is an integer number (25689400).

Almost surely, 2^51378799 is an apocalyptic number.

51378799 is a deficient number, since it is larger than the sum of its proper divisors (1).

51378799 is an equidigital number, since it uses as much as digits as its factorization.

51378799 is an evil number, because the sum of its binary digits is even.

The product of its digits is 476280, while the sum is 49.

The square root of 51378799 is about 7167.9005991992. The cubic root of 51378799 is about 371.7588500476.

The spelling of 51378799 in words is "fifty-one million, three hundred seventy-eight thousand, seven hundred ninety-nine".