51305269 has 4 divisors (see below), whose sum is σ = 54323244. Its totient is φ = 48287296.

The previous prime is 51305257. The next prime is 51305297. The reversal of 51305269 is 96250315.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 39312900 + 11992369 = 6270^2 + 3463^2 .

It is a cyclic number.

It is not a de Polignac number, because 51305269 - 2⁵ = 51305237 is a prime.

It is a super-2 number, since 2×51305269² = 5264461254324722, which contains 22 as substring.

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 51305269.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51305299) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1508962 + ... + 1508995.

It is an arithmetic number, because the mean of its divisors is an integer number (13580811).

Almost surely, 2^51305269 is an apocalyptic number.

It is an amenable number.

51305269 is a deficient number, since it is larger than the sum of its proper divisors (3017975).

51305269 is a wasteful number, since it uses less digits than its factorization.

51305269 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3017974.

The product of its (nonzero) digits is 8100, while the sum is 31.

The square root of 51305269 is about 7162.7696458842. The cubic root of 51305269 is about 371.5814196717.

The spelling of 51305269 in words is "fifty-one million, three hundred five thousand, two hundred sixty-nine".