51040065 has 8 divisors (see below), whose sum is σ = 81664128. Its totient is φ = 27221360.

The previous prime is 51040051. The next prime is 51040081. The reversal of 51040065 is 56004015.

It is a happy number.

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

It is not a de Polignac number, because 51040065 - 2¹⁶ = 50974529 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, 1701321 + ... + 1701350.

It is an arithmetic number, because the mean of its divisors is an integer number (10208016).

Almost surely, 2^51040065 is an apocalyptic number.

It is an amenable number.

51040065 is a deficient number, since it is larger than the sum of its proper divisors (30624063).

51040065 is a wasteful number, since it uses less digits than its factorization.

51040065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3402679.

The product of its (nonzero) digits is 600, while the sum is 21.

The square root of 51040065 is about 7144.2329889219. The cubic root of 51040065 is about 370.9400614682.

The spelling of 51040065 in words is "fifty-one million, forty thousand, sixty-five".