51018645 has 16 divisors (see below), whose sum is σ = 81726912. Its totient is φ = 27177600.

The previous prime is 51018589. The next prime is 51018659. The reversal of 51018645 is 54681015.

It is not a de Polignac number, because 51018645 - 2⁹ = 51018133 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16470 + ... + 19320.

It is an arithmetic number, because the mean of its divisors is an integer number (5107932).

Almost surely, 2^51018645 is an apocalyptic number.

It is an amenable number.

51018645 is a deficient number, since it is larger than the sum of its proper divisors (30708267).

51018645 is a wasteful number, since it uses less digits than its factorization.

51018645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4052.

The product of its (nonzero) digits is 4800, while the sum is 30.

The square root of 51018645 is about 7142.7337203623. The cubic root of 51018645 is about 370.8881633637. Note that the first 3 decimals are identical.

The spelling of 51018645 in words is "fifty-one million, eighteen thousand, six hundred forty-five".