51135643 has 16 divisors (see below), whose sum is σ = 59675616. Its totient is φ = 43384320.

The previous prime is 51135641. The next prime is 51135653. The reversal of 51135643 is 34653115.

It is a cyclic number.

It is not a de Polignac number, because 51135643 - 2¹ = 51135641 is a prime.

It is a super-2 number, since 2×51135643² = 5229707970046898, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51135641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6813 + ... + 12193.

It is an arithmetic number, because the mean of its divisors is an integer number (3729726).

Almost surely, 2^51135643 is an apocalyptic number.

51135643 is a deficient number, since it is larger than the sum of its proper divisors (8539973).

51135643 is a wasteful number, since it uses less digits than its factorization.

51135643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5454.

The product of its digits is 5400, while the sum is 28.

The square root of 51135643 is about 7150.9190318448. The cubic root of 51135643 is about 371.1714587825.

Adding to 51135643 its reverse (34653115), we get a palindrome (85788758).

The spelling of 51135643 in words is "fifty-one million, one hundred thirty-five thousand, six hundred forty-three".