51555137 has 2 divisors, whose sum is σ = 51555138. Its totient is φ = 51555136.

The previous prime is 51555131. The next prime is 51555157. The reversal of 51555137 is 73155515.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 47389456 + 4165681 = 6884^2 + 2041^2 .

It is a cyclic number.

It is not a de Polignac number, because 51555137 - 2¹⁸ = 51292993 is a prime.

It is not a weakly prime, because it can be changed into another prime (51555131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25777568 + 25777569.

It is an arithmetic number, because the mean of its divisors is an integer number (25777569).

Almost surely, 2^51555137 is an apocalyptic number.

It is an amenable number.

51555137 is a deficient number, since it is larger than the sum of its proper divisors (1).

51555137 is an equidigital number, since it uses as much as digits as its factorization.

51555137 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13125, while the sum is 32.

The square root of 51555137 is about 7180.1905963561. The cubic root of 51555137 is about 372.1836709098.

The spelling of 51555137 in words is "fifty-one million, five hundred fifty-five thousand, one hundred thirty-seven".