51345865 has 8 divisors (see below), whose sum is σ = 65239560. Its totient is φ = 38660352.

The previous prime is 51345859. The next prime is 51345893. The reversal of 51345865 is 56854315.

It can be written as a sum of positive squares in 4 ways, for example, as 2569609 + 48776256 = 1603^2 + 6984^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 51345865 - 2³ = 51345857 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 301950 + ... + 302119.

It is an arithmetic number, because the mean of its divisors is an integer number (8154945).

Almost surely, 2^51345865 is an apocalyptic number.

It is an amenable number.

51345865 is a deficient number, since it is larger than the sum of its proper divisors (13893695).

51345865 is a wasteful number, since it uses less digits than its factorization.

51345865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 604091.

The product of its digits is 72000, while the sum is 37.

The square root of 51345865 is about 7165.6029055481. The cubic root of 51345865 is about 371.6794001371.

The spelling of 51345865 in words is "fifty-one million, three hundred forty-five thousand, eight hundred sixty-five".