51306065 has 4 divisors (see below), whose sum is σ = 61567284. Its totient is φ = 41044848.

The previous prime is 51306053. The next prime is 51306083. The reversal of 51306065 is 56060315.

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 32444416 + 18861649 = 5696^2 + 4343^2 .

It is a cyclic number.

It is not a de Polignac number, because 51306065 - 2⁶ = 51306001 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5130602 + ... + 5130611.

It is an arithmetic number, because the mean of its divisors is an integer number (15391821).

Almost surely, 2^51306065 is an apocalyptic number.

It is an amenable number.

51306065 is a deficient number, since it is larger than the sum of its proper divisors (10261219).

51306065 is a wasteful number, since it uses less digits than its factorization.

51306065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10261218.

The product of its (nonzero) digits is 2700, while the sum is 26.

The square root of 51306065 is about 7162.8252107670. The cubic root of 51306065 is about 371.5833413540.

The spelling of 51306065 in words is "fifty-one million, three hundred six thousand, sixty-five".