51643129 has 4 divisors (see below), whose sum is σ = 52844176. Its totient is φ = 50442084.

The previous prime is 51643103. The next prime is 51643183. The reversal of 51643129 is 92134615.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51643129 - 2¹¹ = 51641081 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 51643129.

It is not an unprimeable number, because it can be changed into a prime (51643429) 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 3 ways as a sum of consecutive naturals, for example, 600459 + ... + 600544.

It is an arithmetic number, because the mean of its divisors is an integer number (13211044).

Almost surely, 2^51643129 is an apocalyptic number.

It is an amenable number.

51643129 is a deficient number, since it is larger than the sum of its proper divisors (1201047).

51643129 is a wasteful number, since it uses less digits than its factorization.

51643129 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1201046.

The product of its digits is 6480, while the sum is 31.

The square root of 51643129 is about 7186.3153980326. The cubic root of 51643129 is about 372.3952927029.

The spelling of 51643129 in words is "fifty-one million, six hundred forty-three thousand, one hundred twenty-nine".