51550091 has 2 divisors, whose sum is σ = 51550092. Its totient is φ = 51550090.

The previous prime is 51550073. The next prime is 51550099. The reversal of 51550091 is 19005515.

51550091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 51550091 - 2⁶ = 51550027 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 51550091.

It is not a weakly prime, because it can be changed into another prime (51550099) 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, 25775045 + 25775046.

It is an arithmetic number, because the mean of its divisors is an integer number (25775046).

Almost surely, 2^51550091 is an apocalyptic number.

51550091 is a deficient number, since it is larger than the sum of its proper divisors (1).

51550091 is an equidigital number, since it uses as much as digits as its factorization.

51550091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1125, while the sum is 26.

The square root of 51550091 is about 7179.8392043276. The cubic root of 51550091 is about 372.1715279228.

The spelling of 51550091 in words is "fifty-one million, five hundred fifty thousand, ninety-one".