51455865 has 8 divisors (see below), whose sum is σ = 82329408. Its totient is φ = 27443120.

The previous prime is 51455843. The next prime is 51455869. The reversal of 51455865 is 56855415.

51455865 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 51455865 - 2⁷ = 51455737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51455869) 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 7 ways as a sum of consecutive naturals, for example, 1715181 + ... + 1715210.

It is an arithmetic number, because the mean of its divisors is an integer number (10291176).

Almost surely, 2^51455865 is an apocalyptic number.

It is an amenable number.

51455865 is a deficient number, since it is larger than the sum of its proper divisors (30873543).

51455865 is a wasteful number, since it uses less digits than its factorization.

51455865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3430399.

The product of its digits is 120000, while the sum is 39.

The square root of 51455865 is about 7173.2743569447. The cubic root of 51455865 is about 371.9446313130.

The spelling of 51455865 in words is "fifty-one million, four hundred fifty-five thousand, eight hundred sixty-five".