51555157 has 2 divisors, whose sum is σ = 51555158. Its totient is φ = 51555156.

The previous prime is 51555137. The next prime is 51555173. The reversal of 51555157 is 75155515.

It is a happy number.

51555157 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 can be written as a sum of positive squares in only one way, i.e., 33628401 + 17926756 = 5799^2 + 4234^2 .

It is a cyclic number.

It is not a de Polignac number, because 51555157 - 2²³ = 43166549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (51555137) 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, 25777578 + 25777579.

It is an arithmetic number, because the mean of its divisors is an integer number (25777579).

Almost surely, 2^51555157 is an apocalyptic number.

It is an amenable number.

51555157 is a deficient number, since it is larger than the sum of its proper divisors (1).

51555157 is an equidigital number, since it uses as much as digits as its factorization.

51555157 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21875, while the sum is 34.

The square root of 51555157 is about 7180.1919890766. The cubic root of 51555157 is about 372.1837190374.

The spelling of 51555157 in words is "fifty-one million, five hundred fifty-five thousand, one hundred fifty-seven".