51750991 has 2 divisors, whose sum is σ = 51750992. Its totient is φ = 51750990.

The previous prime is 51750971. The next prime is 51751019. The reversal of 51750991 is 19905715.

It is a happy number.

51750991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 51750991 - 2⁷ = 51750863 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51750991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51750961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25875495 + 25875496.

It is an arithmetic number, because the mean of its divisors is an integer number (25875496).

Almost surely, 2^51750991 is an apocalyptic number.

51750991 is a deficient number, since it is larger than the sum of its proper divisors (1).

51750991 is an equidigital number, since it uses as much as digits as its factorization.

51750991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 14175, while the sum is 37.

The square root of 51750991 is about 7193.8161639008. The cubic root of 51750991 is about 372.6543744028.

The spelling of 51750991 in words is "fifty-one million, seven hundred fifty thousand, nine hundred ninety-one".