51065155 has 4 divisors (see below), whose sum is σ = 61278192. Its totient is φ = 40852120.

The previous prime is 51065137. The next prime is 51065173. The reversal of 51065155 is 55156015.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (51065137) and next prime (51065173).

It is not a de Polignac number, because 51065155 - 2²³ = 42676547 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 5106511 + ... + 5106520.

It is an arithmetic number, because the mean of its divisors is an integer number (15319548).

Almost surely, 2^51065155 is an apocalyptic number.

51065155 is a deficient number, since it is larger than the sum of its proper divisors (10213037).

51065155 is a wasteful number, since it uses less digits than its factorization.

51065155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10213036.

The product of its (nonzero) digits is 3750, while the sum is 28.

The square root of 51065155 is about 7145.9887349477. The cubic root of 51065155 is about 371.0008330832. Note that the first 3 decimals are identical.

The spelling of 51065155 in words is "fifty-one million, sixty-five thousand, one hundred fifty-five".