51115643 has 8 divisors (see below), whose sum is σ = 55119120. Its totient is φ = 47243520.

The previous prime is 51115613. The next prime is 51115657. The reversal of 51115643 is 34651115.

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 51115643 - 2¹⁰ = 51114619 is a prime.

It is a super-2 number, since 2×51115643² = 5225617918606898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51115613) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32030 + ... + 33587.

It is an arithmetic number, because the mean of its divisors is an integer number (6889890).

Almost surely, 2^51115643 is an apocalyptic number.

51115643 is a deficient number, since it is larger than the sum of its proper divisors (4003477).

51115643 is a wasteful number, since it uses less digits than its factorization.

51115643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65677.

The product of its digits is 1800, while the sum is 26.

The square root of 51115643 is about 7149.5204734304. The cubic root of 51115643 is about 371.1230620299.

Adding to 51115643 its reverse (34651115), we get a palindrome (85766758).

The spelling of 51115643 in words is "fifty-one million, one hundred fifteen thousand, six hundred forty-three".