51555155 has 16 divisors (see below), whose sum is σ = 63232704. Its totient is φ = 40343040.

The previous prime is 51555137. The next prime is 51555157. The reversal of 51555155 is 55155515.

51555155 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51555155 - 2¹⁰ = 51554131 is a prime.

It is a nude number because it is divisible by every one of its digits.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51555157) 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 in 15 ways as a sum of consecutive naturals, for example, 49490 + ... + 50520.

It is an arithmetic number, because the mean of its divisors is an integer number (3952044).

Almost surely, 2^51555155 is an apocalyptic number.

51555155 is a deficient number, since it is larger than the sum of its proper divisors (11677549).

51555155 is a wasteful number, since it uses less digits than its factorization.

51555155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1246.

The product of its digits is 15625, while the sum is 32.

The square root of 51555155 is about 7180.1918498046. The cubic root of 51555155 is about 372.1837142246.

The spelling of 51555155 in words is "fifty-one million, five hundred fifty-five thousand, one hundred fifty-five".