51663071 has 6 divisors (see below), whose sum is σ = 54525672. Its totient is φ = 48943620.

The previous prime is 51663047. The next prime is 51663089. The reversal of 51663071 is 17036615.

51663071 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-51663071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51663041) 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 5 ways as a sum of consecutive naturals, for example, 71195 + ... + 71916.

It is an arithmetic number, because the mean of its divisors is an integer number (9087612).

Almost surely, 2^51663071 is an apocalyptic number.

51663071 is a deficient number, since it is larger than the sum of its proper divisors (2862601).

51663071 is a wasteful number, since it uses less digits than its factorization.

51663071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143149 (or 143130 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 51663071 is about 7187.7027623574. The cubic root of 51663071 is about 372.4432200289.

Adding to 51663071 its reverse (17036615), we get a palindrome (68699686).

The spelling of 51663071 in words is "fifty-one million, six hundred sixty-three thousand, seventy-one".