51807155 has 16 divisors (see below), whose sum is σ = 65482560. Its totient is φ = 39270528.

The previous prime is 51807139. The next prime is 51807157. The reversal of 51807155 is 55170815.

It is a happy number.

51807155 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 51807155 - 2⁴ = 51807139 is a prime.

It is a super-3 number, since 3×51807155³ (a number of 24 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (51807157) 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, 10469 + ... + 14601.

It is an arithmetic number, because the mean of its divisors is an integer number (4092660).

Almost surely, 2^51807155 is an apocalyptic number.

51807155 is a deficient number, since it is larger than the sum of its proper divisors (13675405).

51807155 is a wasteful number, since it uses less digits than its factorization.

51807155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4270.

The product of its (nonzero) digits is 7000, while the sum is 32.

The square root of 51807155 is about 7197.7187358218. The cubic root of 51807155 is about 372.7891363525.

The spelling of 51807155 in words is "fifty-one million, eight hundred seven thousand, one hundred fifty-five".