51111065 has 4 divisors (see below), whose sum is σ = 61333284. Its totient is φ = 40888848.

The previous prime is 51111031. The next prime is 51111089. The reversal of 51111065 is 56011115.

51111065 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 17505856 + 33605209 = 4184^2 + 5797^2 .

It is a cyclic number.

It is not a de Polignac number, because 51111065 - 2¹² = 51106969 is a prime.

It is a super-2 number, since 2×51111065² = 5224681930868450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 5111102 + ... + 5111111.

It is an arithmetic number, because the mean of its divisors is an integer number (15333321).

Almost surely, 2^51111065 is an apocalyptic number.

It is an amenable number.

51111065 is a deficient number, since it is larger than the sum of its proper divisors (10222219).

51111065 is a wasteful number, since it uses less digits than its factorization.

51111065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10222218.

The product of its (nonzero) digits is 150, while the sum is 20.

The square root of 51111065 is about 7149.2003049292. The cubic root of 51111065 is about 371.1119822377. Note that the first 3 decimals are identical.

The spelling of 51111065 in words is "fifty-one million, one hundred eleven thousand, sixty-five".