51231799 has 2 divisors, whose sum is σ = 51231800. Its totient is φ = 51231798.

The previous prime is 51231793. The next prime is 51231821. The reversal of 51231799 is 99713215.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51231799 - 2⁵ = 51231767 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51231793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25615899 + 25615900.

It is an arithmetic number, because the mean of its divisors is an integer number (25615900).

Almost surely, 2^51231799 is an apocalyptic number.

51231799 is a deficient number, since it is larger than the sum of its proper divisors (1).

51231799 is an equidigital number, since it uses as much as digits as its factorization.

51231799 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17010, while the sum is 37.

The square root of 51231799 is about 7157.6392057717. The cubic root of 51231799 is about 371.4039646773.

The spelling of 51231799 in words is "fifty-one million, two hundred thirty-one thousand, seven hundred ninety-nine".