51199739 has 2 divisors, whose sum is σ = 51199740. Its totient is φ = 51199738.

The previous prime is 51199717. The next prime is 51199781. The reversal of 51199739 is 93799115.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51199739 - 2⁸ = 51199483 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51199739.

It is not a weakly prime, because it can be changed into another prime (51199639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25599869 + 25599870.

It is an arithmetic number, because the mean of its divisors is an integer number (25599870).

Almost surely, 2^51199739 is an apocalyptic number.

51199739 is a deficient number, since it is larger than the sum of its proper divisors (1).

51199739 is an equidigital number, since it uses as much as digits as its factorization.

51199739 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 76545, while the sum is 44.

The square root of 51199739 is about 7155.3992900466. The cubic root of 51199739 is about 371.3264757220.

The spelling of 51199739 in words is "fifty-one million, one hundred ninety-nine thousand, seven hundred thirty-nine".